Unless I'm reading the first post wrong, he's switching from a 454 to a 454? I've used the kwik adapter Brackets, they work great, but are for a 350 bracket system on a 454. I can't say much about swapping different big block bracket systems and whether or not they are interchangable. I can tell you the kwik brackets are $163 now, plus the cost of the sbc brackets if you don't have any laying around.