You'll be re-routing the wires in the engine compartment harness. Starter is on the wrong side, alternator may or may not be.
Be sure the torque converter will bolt to the flywheel, and the torque converter pilot is the right size for the register at the back of the crank. Depending on the thickness of the adapter, you may/may not need longer engine-to-trans dowel pins.
You'll almost certainly be playing games with throttle lever unless you're using the TBI unit from the Chevy 5.7 engine. You'll need the throttle cable to fit, and also the TV cable from the trans. The early 454 TBI had an adapter that converts a standard Q-Jet carb pad to a TBI mount. Works nice, heated via heater-hose water. Available on eBay or from a well-stocked Treasure Yard.
If the cam was mild enough, I don't know why a Chevy 5.7L TBI, computer, and wire harness wouldn't work on a Pontiac 5.7L--as long as you can find a place to screw in all the sensors. The knock sensor and EGR might be the problem children. I'm not expert enough on the ignition module compatibility--it might be that a 7-pin module and distributor for Pontiac will interface with the GM computer--or maybe not. I hear some crazy stories about the Chevy-style 8-pin modules having various timing curves.
I would be using clamshell mounts, but whether big car or F-body would fit better, I don't know.
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