Does the 1987 Caprice Classic 5.0 carbureted have a Chevy 305 engine or an olds 307?

A 1987 Chevy Caprice Classic with the original engine does have a carb and the engine is a 305, because I have one. This can have a 307. I have an 87 Caprice Estate Wagon, with a 5.0 liter 307 olds. Which, is actually for sale.