Hi, I know that for the 70-71-72 buick GS the Original bellhousing was the BOP type that featured 2 bumps on each side to accomodate the starter location on all BOP engine.I was wondering if I will have clearence problems with the drivers side bump (Olds and pontiac starter location) of this bellhousing if I am using Hookers long tubes headers?? Thanks guys I tought about using the old 67...something buick only bellhousing but finding the inspection cover for this one is a challenge...