17054920 which primary rods ? early or late ?

[Frank400]

I'm working on a friend's Quadrajet and the number is 17054920, research comes up as service replacement for 74 Vette replacement.  That I am not 100% sure, could someone confirm ?

  Now the real question: primary jets were 71 and 48B primary rods.  Now those are the long early style rods.  Usually the 170 series carb use the shorter metering rods, but this carb is not a M4, still has the early style body with coil type choke on the intake manifold, so is it ok to have early longer rods in that carb even though it's number starts with 170 ? 

   Also, would someone know what was the original metering in that carb ?  Strange thing is upper main air bleeds were .052" and lower main air bleeds were .120". 

  I have converted it to .070 in both to follow Cliff's recipe but I'm pretty sure those air bleeds did not come that way.

    Frank.

[Cliff Ruggles]

It takes the early style longer primary metering rods.

Most like it has been commercially "remanufactured" at some point if it had restrictions driven into the upper main airbleed locations....

[mcx]

If it has a base plate APT (instead of the air lid), it should use  lo ger "B" primary rods.

[Kenth]

17054920 is a service replacement unit for Chevy Y, A, ASP, F, X body vehicles.
Uses #75 main jets, 46B pri rods and CH sec rods. Upper and lower main air bleeds are .120".