I utilizing a Edelbrock 650 on my 347 Stroker (425+HP). Most I talked to said to upgrade to an 770-850 (basically that the engine is looking for more gas). I get a little hesitation especially at low RPM range, and also when cruising on the expressway (2000-2500 RPM) and lift and apply gas again. Did go through the Edelbrock manual changing the "cruise" and "power" range meters three times - help, but still a minor hick cup. I haven't increased the jets yet, but see no great instruction how to in the manual - assuming I need to remove the carb top. I also moved the linkage to also feed more fuel to the engine.

Walter