Can you put 350 heads and cam on a 307 Oldsmobile engine?

You can *physically* put a 350 Chevy heads and cam on a 307 Oldsmobile engine, but it won't work. The bolt patterns, valve angle, and deck height are completely different between a Chevy small-block (350) and an Oldsmobile small-block (307). They are not interchangeable. You'd need to do extensive and impractical modifications (likely requiring custom machining) to even attempt it, and the result wouldn't be a functional engine. It would be far easier, and cheaper, to find appropriate parts for the 307 Oldsmobile.