Will a 350 Pontiac motor fit in 1980 cutlass supreme?

No, a 350 Pontiac motor will not fit in a 1980 Cutlass Supreme because the engine is too big for the car's engine compartment. The 1980 Cutlass Supreme was designed to fit a smaller engine, such as the V6 engine that came standard in the car. Installing a 350 Pontiac motor would require extensive modifications to the engine compartment, and it is likely that the car's performance and handling would be negatively affected.