Chevy c20 1971 hot rod project. Gearing

I wanna make my truck faster and put some street slicks. My dad was talking about I should get a ford 8.8 axle to fit these fat tires under my truck. What is the best gearing set up to haul *** for my truck. Also, how can I get cheap hp out of my truck it has a 350.

3.73…3.90… Or…4.10…