Hello, thanks for viewing. I'm putting together a Scarab 22 with a Gen 6 closed loop cooling system 454HO. Question is; while installing the aluminum intake manifold, my Fel-Pro marine gasket kit came with stainless restrictor plates for the intake gaskets. "DO I NEED THESE or just discard them. Thanks all!!

I don't use them in Mark IV or Gen V BBC's

I think you are talking about restrictors for the heat riser passage in the center. Yes use them or even better block off completely.