Edelbrock performer 600cfm part #1406. I had to replace my old Qjet around christmas. The performer is the cheapest I could find, and the most simple. BE SURE TO USE THE EDELBROCK ADAPTER for your q-jet manifold. I tried the Mr. Gasket brand and had a huge dead spot when accelerating. I got the model with an electric choke but I have installed one with the mechanical choke on a friends truck and both of us are very pleased with them. I havent ever touched my ajustment screws since it came out of the box. I hear the edelbrock Q-jets are good, but from what I have seen not worth the extra $$. I have my base timing set to 11 degrees. I have a 76 model 350 in an 87 swb truck, GM aluminium intake, 4 speed w/o OD, 3.42 rear end gears, and worn out 32x11.50 mud tires. If I run between 50-60MPH on the highway I am getting around 14 MPG or better!! I checked mileage with a little city driving and WOT threw in and got 13.8 MPG on a 50 mile round trip. I have never checked local city driving, but I know its not 14. A PROPERLY WORKING Q-jet would probally do better, but those can be hard to come by. With mileage that good and a noticable power diffrence you cant go wrong with the performer. I took mine appart once to clean it out and that was very simple too. IMHO the only thing better is fuel injection. If my TBI swap works out, Ill post back on the diffrence.
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