No late model Fifths with a 4-barrel.

There is another thing that GM did with the Q-jets and the electric valve. On some they used it to block off a p[ortion of the float bowl for evap emissions, I believe. You really don't know until you take it apart.

There is a number on the back of the carb, each Q-jet had a code. Look online for decoding quadrajets and you'll see what I mean. I recently bought a raft of high altitude and California emissions Q-jets for mileage work in the mountains. Once you learn the code it's all downhill.

SFT, the Edelbrock Q-jet is a choice piece, I have bought three over the years, cheapest one was something like $80. The most expensive one was like $120. It looks to me that Edelbrock started out with regulation Rochester bodies.

R.