If I might suggest, since you don't have a dyno available, your not really going to know what your actual HP output will be so, when you get the flow numbers for your heads, let Werby, Gonk it, for 500 HP and build to that spec. That way, you'll have something in the ball part and can say, it's a 500 HP engine, with some backing.
If you're willing to travel 300 miles, there is a SF901, in Medford to hook it up to. I don't know if Redding is closer but, there might be one there, too.