A few other things to change, also. Starter on a chebbie engine is the opposite side of a Pontiac so you'll have to move the battery tray and some of the wiring. I believe the radiator outlets are different also. Might want to check that out.

The transmission mount and driveshaft should be ok as is, just a matter of drilling holes in the front crossmember to relocate the motor mounts. Should be able to use Camaro mounts on the crossmember and the block.