Pretty sure that vintage Cutlass was a 307 Oldsmobile engine. Different block and heads. Similar power limitation. Good engine for durability.
It was a Chevy 305. 100% sure. It was a Cutlass Supreme Brougham, four door.
That car was actually in a movie once lol. It's in the trailer here at 1:53. They paid us $150 to use it for a day and filled it with fuel