505 stroker fresh off the dyno - Power seems low? Thoughs?

I think the HP is about right for the SFT cam you used. It is not that big for a 500+ in stroker, with the consequent power you got. You might be able to tease out a few more HP by experimenting with the cam's ICL [ I would retard it 4* to start with ], timing, carb spacer.