"Mike, if you find them let me
"Mike, if you find them let me know. I have Chrysler/Ford 460 inboards. Chrysler used the block when they stopped making the 440. Had their own exhaust manifolds made with no aftermarket manufacturer. Replaced originals with OMC several years back, but they were raw water cooled. Had to rebuild engines and could not locate either Chrysler or OMCs.
Found a marine racing outfit in California that makes billet aluminum adapters for the 460 block that allows bolting 454 exhaust manifolds. Not the best solution, but better than deep sixing the motors. Needed to protect plug wires due to the fact that adapters get quite hot.
Let us know what you find.
Gene"