So I just bought this gasket set for my 318 with the later 302 heads and a Performer RPM intake. Came with 2 metal plates that I RTV'd to the head, then put the gasket on. Seemed to fit pretty well and once it was bolted up appeared to seal great in that area. HOWEVER, apparently the coolant passages in the gasket are far too big because coolant pours out of the back left side of the intake and head. Probably should have checked the fit before I started sealing stuff in place. Just wanted to share my experience, which may or may not be relevant to your application.