Interesting... I realize you're not aiming for the restoration market with your concept but rather for the guys tweaking as much HP as they can out of their motors. - So the purists out there may cringe at the idea of putting Chebby parts on their cars but most likely the blocks would be actually using aftermarket heads from those companies like Brodix - not Chevrolet. Once people wrap their heads (no pun intended) around the concept that they're not committing sacrilege adding parts off a GM to their cars they may accept it.
There isn't a Mopar owner that hasn't realized how much more expensive it is to build a Chrysler than brand X. - But most of us bite the bullet and pony up because of our devotion to our Mopars. Head selection has hurt us. Most aftermarket companies have been less likely to devote the engineering costs for Mopars because the market is smaller.
Intake & exhaust may be your biggest obstacle. - The low cost solution may end up awfully expensive.
Good luck with your idea and I hope it pans out. Why would it matter to some if they were telling folks they were running Brodix instead of Edelbrock or Trick Flow?