The 'other' options are to stay with Mopar, either small block or big block parts. The small block t-c cover requires some machining/fussing and the B-RB assembly mounts with adapters but requires aditional plumbing for the heads to pump connection. I have the block to housing adapters but lack of consumer interest keeps the remainder of the 'package' on the drawing board. We have done both swaps, both work well. Here is the B-RB on top of the fat Moon cover: We haven't done a sb cover lately so no pics. .