I VERY HIGHLY recommend Romeys automotive machining, 303-629-0561. They are at 859 north federal, in denver. These are the guys who built the 400 in my truck and that engine has taken way more abuse than i ever imagined it could, and still does not miss a lick. They have also done quite a few engines for my friends (racing buddies) anything from OEM rebuilds to very high performance engines. Just let them know that John from Georgetown sent you down there and they will take good care of you, just like they do with all of their good customers.