[Jeff Lee]

I agree with allowing aftermarket replacement heads on any Superstock. Heck, probably Stock as well. Reason being is what's good for the goose is good for the gander. That's what grandpa used to say.
If your argument is "you knew what was in the rulebook when you started racing SS" well, no.
At one time you could look through the blueprint or casting numbers and determine if you should or should not build a particular engine. Maybe you found an advantageous set of heads. You build your car. A few years go by and now your competitors, the ones who may have had inferior heads from the factory, now have a "one size fits all" and all of the sudden that lowly go to the grocery store engine is a killer. So why does one segment deserve these wonderful choices and not the other? Who wants to shut the door on the rest of us? That would be those that want to preserve their own advantages (recent advantages I should point out) to retain an un-level playing field or as X-Tech stated, want a corner on a market.
So I'm not even arguing price. High prices are a given in SS (and Stock higher classes). I'm arguing equal opportunity for all. Edelbrock makes heads for almost every brand out there, even the lowly AMC. You can even find aluminum heads for Cadillac.