With metal gaskets such as the BB Mopar valley pan, there are raised embossings around the ports -- those do the primary sealing around the ports when the gasket gets compressed. The fiber supplementary gaskets are intended to take up any out-of-flat or surface imperfections... they were OE ONLY on the aluminum six-pack intakes from Ma-Mopar back in 1969... they are actually a good install for all BB intakes regardless of the intake -- cast iron or aluminum.

IF you choose to re-use the metal valley pan, be certain to install the fiber side gaskets to help seal it up. IF the embossings are crushed flat, as they likely will be, then the fiber side gaskets will help to seal.

I'm a former gasket engineer from Fel-Pro... Good luck with the install.

Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!