Look at where the top radiator hose goes into the engine. If it's straight up and goes into the block, it's a Cleveland. If it's horizontal and goes into the intake manifold, it's a Windsor.
The normal 302 is similar to the Windsor but with a shorter deck height on the Block. The water connection is on the Manifold like the 351 Windsor but the manifold is noticeably narrower. There was a Boss 302 built for two years in 1969 - 1970 that is basically a 302 with Cleveland heads, they were extremely rare and used only on some special Mustangs.
