Bellhousing patterns are different, so if this is an automatic you're talking about, there is no practical way to swap the tranny from the BOP pattern to Chevy. No - it cannot be interchanged. If it's a 4-speed, the tranny is identical and will swap over if you use the Chevy bellhousing.
No - there are no parts that interchange between a Pontiac V8 and any Chevy V8 except maybe the thermostat...