Glenn,
The only thing that I was tempted to get used was a rear axle, and the only parts of that that would be re-used were the housing, cover and yoke. Mine came from Mike Forte, all I had to do was paint it. I have a 351 in the shop, but when we added aluminum heads and intake manifold and everything else, that made no sense either. Our 408 Windsor comes with a dyno sheet from a proven combination. (515 hp) I listened to a Coyote respond to a programmer, AMAZING So I agree with your Coyote decision. I'm just an old school guy. We are going carbureted, and it was dynoed on the engine too.
Come on spring!!! Glen