Personally I would have put an FQR drop in complete in there.
Exceptional warranty and it's good anywhere, and if there's any problems Ford's on the hook, not you personally or your shop.
I don't know what you guys are paying for them there, but a buddy of mine is in the Chicago area and is paying 14-15 for a complete drop in 6.4, I can't imagine the 6.0 being more.