400 help

[Silverray76]

All of the advice is helping guys.

This truck is my daily i drive no more than 4 miles to work and only 12 round trip to school. Its a 2x4. I'm deciding to do this because im rebuilding the entire truck all over again and i would like more hp out of a new motor. I would like for my truck to run at least a 12 sec and i was planning to go out and find a rear end with 373 gears and posi. I want to keep it a auto and i belive my tranny has a B&M 2100 stall convertor and i plan to run pump gas