Q-Jet conversion

[Mertz]

I have a 72 3/4 ton with 350 that I have been running with an Edelbrock EPS manifold and Edelbrock 1406 carb. I wanted to get better gas mileage so I switched to a stock aluminum EGR intake manifold and a Jet stage II Q-jet. It idles fine and I had it at 20" Hg. The problem was I had no power when I hit the gas from idle or a slow roll. I could get it up to speed and it would work better. The last time I drove it it would act like it died when I floored it but after I pumped it it would run again. I was told I might have a internal leak at the intake manifold but found no oil in the manifold. I am using a 1" phenolic spacer.

I bought the carb used and the secondary linkage was sticking but I freed it up. Could this be to much carb for the motor or does this sound like the secondaries aren't working? The guy said he had it on a 318 but took it off before selling the car. It looks brand new.