Will a 1991 305 engine fit in my 1987 cutlass supreme?
The 87 could come stock with a 305 so yes, easily.
I have a 1986 Regal it has a 307 in it so it should fit
Yes unless you have the v6 in there now. It'll still fit but you need all of the v8 stuff to go with it.
Looking for a Used Cutlass Supreme in your area?
CarGurus has 98 nationwide Cutlass Supreme listings and the tools to find you a great deal.
Search Oldsmobile Cutlass Supreme Questions
Oldsmobile Cutlass Supreme Experts