And thus one of the most outlandish engines Ford ever built was ... meant to go together. The 429/460 blocks share the same bore centers and bolt patterns as the Boss 429 block.

and identical displacements using four-bolt main cap engine blocks based on Ford's 385-series engine. However, the Boss 429 block has a unique engine block casting with screw-in freeze plugs.

the 302/351W small-block Ford V-8, or the 429 ... engine series there are differences in engine mounts and frame perches, the front crossmembers, and the bellhousing/rear engine-face bolt-pattern ...