Also take into consideration whether it's a street car or not. Copper gaskets are famous for problems with sealing water jackets. SCE has some new copper gaskets with a 'printoseal' style embossment on them, as well as an integrated fire ring, but I haven't used/sold them personally. Check SCE's website. Personally, I've sold many of the Cometic MLS gaskets for 'hardcore' street car guys with lot's of nitrous, and or blower/turbo cars as well. Never ran into a problem, and they seal the water jackets nicely as well.