Yeah, I understand the premise behind wanting a baseline, but like has allready been pointed out, there really is no baseline for a 400 plus inch build with a factory casting head.
PowerNation did a 360 stroker build with stock heads, RPM AG and the stock cam and made 339 HP and 498 torque. Is that enough of a baseline?
My opinion is that the heads weren't the limiting factor, I think it was the broomstick cam is what kept the HP down. But almost 500 ft/lbs??? Either way, I guess probably not the baseline needed for a cylinder head shootout.