Okay i know if i buy a new fuel pump i should go with a high performance pump but with 255 walbro are they all the same will the one's that fit TPI's and LT1's fit TBI's and if so has anyone just cut the floor pan instead of dropping the rear end off and then dropping the tank.

 

the 255 shoudl work but it might be a too much for the stock fuel lines. Not entirely sure. As for the rear, you dont have to drop it, lowering it should give enough clearence. Just unhook the shocks (remove springs as well), panhard bar, and unhook any cables and the brakelines so they dont break and that should give you enough clearence to get the tank down. You'll also have to lower the exaust as well. Probably also make life easier to empty the tank as much as possible.

 

Do a search, it's been done both ways many many a time.