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Will a 1980 Cutlass Supreme 4.3 V8 engine transmission fit Chevy 350 engine?

No, a 1980 Oldsmobile Cutlass Supreme's 4.3L V6 (it's a V6, not a V8) transmission will not directly fit a Chevy 350 engine. The bolt patterns, bellhousings, and input shaft splines are all different. You'd need an adapter plate and potentially other modifications, and it's generally not a straightforward or recommended swap. The 4.3L transmission is also likely much less robust than what a 350 typically needs.