The guy building my 400 for my race truck is top notch, but he's out of lethbridge (Trev's Automotive), he used to build motors for the jurassic attack and maniac monster trucks, and its all he does, tell him how much you want to spend and what you want to end up with, he builds them properly and will tell you straight up if what you want to do is bs or not, that and he can find what odd or rare part you desire.