Edelbrock Carburetor Tuning

Carburetor tuning has always been a black art to me. I recently swapped out the 2bbl on my stock 318 (other than dual exhausts) for a new Weiand manifold and Edelbrock 4bbl. The motor had really nice throttle response with the old 2bbl, but stumbles and goes flat with the 4bbl. I have a tune up kit for the carb, but the instructions might as well be in Latin. For starters, should I just change the two plunger springs to the strongest ones?