Chevrolet made Two 327 engines- small journal (early) large journal (late).
The 302 327 and 350 share the same 4" bore. So if you have a large journal block with a 4" bore you can build any of these engines with either 2 or 4 bolt mains. The 302 is the hardest to find cranks and Pistons for. A large journal 327 can be built using a 307 crank and 327 Pistons. One of my high school friends had a 67 Camero with a 350 from the factory.
