Understood, good advice. I am not an expert, All I can say is I have used many Qjets on many motors and never had a problem. Not matched or "tuned". Many of my friends have also. These motors probably did not perform to many peoples standards, but they ran good. That's the main reason I like them. I Don't mess with jets or metering rods. Some people I have known get over-hyped on all that from HotRod Magazine articles. I have added TV/kick down cables and all that. My real world experience matches what many say on the web. Many of the differences are simply improvements and design changes like types of chokes, Mod Quad, anti warp design, etc. I must agree that using the carb number supposedly for your engine has got to be good. Especially when it will not be hard to find a suitable one, once you get what numbers you want. You may already have the right carb.
This is from carb company in Canada.
"Because the secondary side of the Qjet opens according to the airflow requirements of the engine, the same basic carburetor size can be used on a large range of engine sizes. The basic 750 cfm QJet casting is used from 231 CID to over 400 CID - the big secondary air valves open only as the engine breathes. For example, on a mild 350 Chevy the air valve will never open all the way - because the motor can't use more than 600 cfm or so."
My comments are to give my point of view and is what I have done/experienced, Jon is the person that can advise as to what is best for you.
