Swapping a small block to big block...who's done it?

The Schmaucker swap kit and headers are a good deal. You'll need to shorten the drive shaft a bit. The 8-1/4 will hold if you don't beat the stones out of her. I'd make an effort to find the 8-3/4 for high performance useage.

MP has frame connectors. There basic and should be welded in.