I can say the fel pro metal bathtub gasket is pretty correct. The composite facing gaskets are wack. My gaskets fit the bathtub gasket well and if Trick Flow based their port and bolt locations off the fel pro composite gasket, they are wrong.

This is why I stated earlier, porting based on a gasket should be avoided.

fast68plymouth do you have a pair of those fel pro's to put back to back and see what I'm talking about?