General Category > Quadrajet Carb Talk and Tips

Picking the right Quadrajet

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gnvair:
I have a 78 Malibu with a factory 4 speed. It still has the original LG3 305 with the Rochester 2 barrel (GM didn't offer the Quadrajet on a 305 until 1979.
I want to swap it over to a 4 barrel. I have in my parts stash an aluminum L82 intake with the provision for the hot air choke like the 79's would have.
In my possession I have 3 Quadrajets:
17059207 (this appears to be the correct carb for a 79 with a 305 and a manual transmission)
17059216 (mfg by Carter). Another 79 carb for an automatic trans application based on the throttle lever)
17058203 (I believe this is a carb for a 78 350 with manual transmission for a Corvette or Camaro).
The first carb still has the caps over the mixture screws.
The second carb someone removed the caps.
The third carb has the older exposed mixture screws with the slotted heads.
Which one should I use and why?
Lastly I eventually want to install a later model Vortec 350. Could I use the same carburetor and if so, what would I have to change to compensate for the displacement change.
Thank you in advance!

gnvair:
I was also curious if the base plates could be swapped around on the 76-80 carburetors meaning swapping a base plate with the exposed mixture screws for one that was originally sealed.

Cliff Ruggles:
Bad idea swapping baseplates around.  They are similar but not exactly the same from part number to part number so they may physically bolt in place but not work correctly.......Cliff

gnvair:
Thank you for your response Cliff. Would you be able to comment on my questions in the first post?

77cruiser:
I'd used the one that looked to be in the best shape.

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