Will a t56 6 speed from 96 camaro fit 86 Corvette?

No, a T56 from a 1996 Camaro will not directly fit a 1986 Corvette without significant modifications. While both might use a T56 transmission, the bellhousing bolt pattern and other mounting points are different between the Camaro and the C4 Corvette. You'd need a custom bellhousing, potentially modified driveshaft, and possibly other adjustments to make it work. It's a substantial undertaking, not a simple swap.