will the zo6 wheels fit a 1990 gmc sierra or will any corvette wheels fit my truck

If the bolt pattern is the same at 4.75" and I'm not sure the Sierra is that size, but the S10 and S15 are, I still doubt they will fit due to backspacing problems. The only Vette wheels that would possibly fit your truck would probably be older ones like 1978 or so. Check your stock wheel backspacing then compare to the Corvette wheels. I'm pretty sure the eighties Vette wheels wouldn't fit either.

Not a chance, your back spacing is going to be way off, and if your truck is 4x4 then there is know way, if your truck is 2x4, the Z06 rims are going to look dumb, if they even bolt up, with the Vettes'
the rear wheels are about 2.5" wider than the fronts, so rotating will never happen, unless you got them for free, with Brand New tires, then who cares!!!!!, .... I would check into buying a nice set of polished Alum. wheels for like $35 a piece, sorry man!