What car is this linkage for ?

[Marx3]

I noticed that the baseplate on a 17058276 I am selling, has a hole in the front, for the third screw that came on later units, but the body does not have a threaded hole there.
I am assuming the baseplate is not the original one for this 17058276.
I am also assuming that I can use the baseplate on the this carb, with no trouble. I checked to see if the gasket sealed up well to both body and baseplate and it looks like there will be no vacum leak and all channels have passage.
Does this linkage look like something out of a Pontiac?

[Ethan1]

I noticed that the baseplate on a 17058276 I am selling, has a hole in the front, for the third screw that came on later units, but the body does not have a threaded hole there.
I am assuming the baseplate is not the original one for this 17058276.
I am also assuming that I can use the baseplate on the this carb, with no trouble. I checked to see if the gasket sealed up well to both body and baseplate and it looks like there will be no vacum leak and all channels have passage.
Does this linkage look like something out of a Pontiac?

 Cliff would be the man to answer this. Never seen one like that, I don't think.

[Marx3]

Aww shoot. With my luck it is some gremlin out of a late 80's motor home :-)
I heard someone talk about a letter with a circle around it, cast  onto the back of the baseplate. P for Pontiac etc... ?

[carmantx]

I have never seen a primary shaft like that.  Looks like it would need some extra clearance. 

[Frank400]

Does it have "metric" idle mixture screws, the ones with the very fine threads ?  Does it look like they were sealed in the first place ?  I'm asking because 78 baseplates should have 10-32 mixture screws, and 79 and later baseplates have metric screws and 3 screws holding the baseplate to the main body.

[Marx3]

Actually it looks like they were never sealed... Didn't pull a screw though.
The baseplate has a C in a circle cast into the top surface near the rear passenger side mounting bolt hole.
I am thinking this may say "Chevy"
I have seen a couple of Pontiac baseplates that said "P" and a couple of Buick's that said "B".
I somehow overlooked that fact with '79 being the year they went from 2 to 3 screws holding the baseplate. Thanks for that :-)

Anyways, I have a 17080272 ( 1980 301 carb I think ), I was thinking I could take the throttle shaft from that one and put into a pre-79 M4 baseplate, to turn that baseplate into a "pontiac" plate.
This IS a Pontiac linkage, right?

[Frank400]

Is the casting number on your baseplate (motorhome carb) is 17060558 ?

[Marx3]

I'll have to check up on that.

[Ethan1]

Actually it looks like they were never sealed... Didn't pull a screw though.
The baseplate has a C in a circle cast into the top surface near the rear passenger side mounting bolt hole.
I am thinking this may say "Chevy"
I have seen a couple of Pontiac baseplates that said "P" and a couple of Buick's that said "B".
I somehow overlooked that fact with '79 being the year they went from 2 to 3 screws holding the baseplate. Thanks for that :-)

Anyways, I have a 17080272 ( 1980 301 carb I think ), I was thinking I could take the throttle shaft from that one and put into a pre-79 M4 baseplate, to turn that baseplate into a "pontiac" plate.
This IS a Pontiac linkage, right?

 Yes, that is the correct linkage for the 17080272 Qjet Pontiac carb.

 Can you please post a photo perpendicular shot of the linkage? It looks "bent" to me?

[Ethan1]

I noticed that the baseplate on a 17058276 I am selling, has a hole in the front, for the third screw that came on later units, but the body does not have a threaded hole there.
I am assuming the baseplate is not the original one for this 17058276.
I am also assuming that I can use the baseplate on the this carb, with no trouble. I checked to see if the gasket sealed up well to both body and baseplate and it looks like there will be no vacum leak and all channels have passage.
Does this linkage look like something out of a Pontiac?

 After looking at other similar Pontiac Qjets, I believe that may be the correct linkage after all.

 Here is a 1977 Pontiac Qjet: http://www.ebay.com/itm/QUADRAJET-CARBURETOR-17057274-M4MC-1977-1978-1979-Pontiac-350-P-400-/271761910898

 Similarities?

[Marx3]

Yes they look exactly alike!
Good. Now I just gotta find a pre-79 baseplate and swap in this linkage.

[Marx3]

Is the casting number on your baseplate (motorhome carb) is 17060558 ?

That is exactly the number on the baseplate in the first picture.