How hard would it be to convert a gm turbo for the 3.8l v6 to fit on a 2.8? I found a bunch on ebay with noreverses and under $200 plus a super has NO boost lag so i dont have to race from 30 mph roll.

Okay... you said "convert a gm turbo from a 3.8l v6" but you are asking about superchargers, so I assuming you mean the roots style superchargers. It would be very complicated to do it. The 3.8 and the 2.8 have the same # of cylinders... that is about where the similarities stop. The only practical way to do it would be to remote mount the SC but that isn't exactly the easiest way to go about it.