I've read that post in the past, I think someones dyno was happy with the #'s I read on there. I've seen these heads in person and also seen them on several combos they are a nice head for a street motor or a lower hp bracket stuff but wont never make hp like a brodix, dart or bmf head does IMO
Your converter sounds right, whats your current cam specs. Your MPH is not off for that et though its fairly normal.