SCE Head Gaskets

I used copper gaskets on 498 with Indy heads. I bought the Isky oring tool and only grooved and wired the block. I used red hi temp silicone on coolant passages and cooper sprayed the gaskets. It ran 8.90s with a 200 shot in a back half duster and never leaked a drop. I believe it was .040 4.380 gasket, block was 4.375. ....... That was then, long before Cometic's.
The felpro 1009 work great also