[Mach 1]

I would say they are the same thing. It/they are expensive. Look through all the mag ads, I think ive seen the holley for as low as $550?

Are u sure you want the holley? I believe the ports are huge and dont match up to any aftermarket head without porting the head, although I guess it works damn good without gasket matching anyway, from what Ive heard.

I was in the same dilema, and decided on a performer rpm. Better looking, lighter, easier install, smaller ports for proper head alignment, removable cover, cheaper, etc...