[Tim Brewer]

I really can't tell what you have, even by looking at your picture. It looks like part of it might need to be welded to the frame, and maybe not for a 460 at all. A 460s' motor mount can be had at any auto parts store. Also, a 460s' mount has three holes that mount to the block, and then two holes on the other side in which a long bolt passes through to then be bolted solidly to the chassis. I don't know if this helps any, but good luck anyway,
Tim