Don there are a lot of aftermarket kits for the 429 and 460's as far as motor mounts and tranny mounts. I don't know much about the cruisomatics, but a c6 bolted to the back of the 460 with your existing 9" rear would do a fine job! I'll hunt arpound for a bolt on motor mount kit, but I bet Dan could fab up some brackets that would be pretty slick!