Inuke, The 250 engine family was first produced 1963 starting with the 194/230/292. The 250 came out a few years later. They all share the same components, distributor, cam, etc, with the exception of crank, rods, and pistons for displacement. The 292 is an exception as well because the block is taller for the long stroke. They all share the same bolt pattern for the bell housing as a SBC. There are other things to watch for and I'm sure others will catch anything I missed.
Larry
