I have an Eagle cast crank, stock floater rods, and ROSS pistons, I had KB pistons, but they don't like WOT throttle for a few minutes at a time, but for you, you would be fine. had to cut a little on the windage tray for the 4" crank, but that's it.
So is it Basically a full rebuild with Shorter Rods & Specially cut Crank?? I know I should know this stuff but I really only ever did stock rebuilds back in the Day.