Lots of people have experience with B1 heads. My opinion for what it matters, just use someone who knows heads period. Guys who know how to make power will make it. With the stock block not sure I'd get to concerned with to much power. Sounds to me like you have some mismatched pieces. Id be looking at tuning the thing to try and find hidden potential, but in the end MPH tells the HP story. Me thinks you are well short of that HP number.