WOW what a way to welcome a new member
whats the big deal lets just point the guy to what he should look for.. that makes a search a lot easier
do a search in this forum for 3.73's vs. 4.10's or anything 4.10 related.. you will come up with many threads and you can use that to figure out what gears you want..
and about the PI stuff, do a search on PI swaps.. the PI stuff is better especially the cams and intake.. So you can either swap just the cams and intake and be a few HP short of a true PI car or you can go all out and do the heads too and be a few horsepower up on a true PI motor ( because of the added compression of the PI heads on the NPI bottom end) or the third option is swap in a junkyard PI motor
Welcome to stangnet.