My 2000 426 just broke an intake valve which then destroyed the valve seat and bounced around in the chamber dinging everything up. I have 2 questions: 1. what other years will swap with my model? Im trying to find a used head but so far can't find a 2000. (anybody have one?) 2. i have seen on other threads talk about having the head rebuilt. anybody know of any links to shops that can rebuild these?