Downsize the cam and convertor. Cheapest way to smooth it out and still have it run good.

I have ridden around in a low budget one with stock edelbrock heads, performer intake, a swap meet 750 afb, and 3:55 gears and it runs 12-teens at over 110mph on narrow street tires. No overheating or anything difficult about it. It uses a lot of gas if you pound on it, but what modified V8 engine doesn't? The owner went from 3:55's to 3:91's out of curiosity and it barely made any difference in et.