[Racer_X]

Definitely recommend Cometic head gaskets, change both sides. I'd change any gasket I touched while disassembling the top end, including exhaust. You might want copper exhaust gaskets for best sealing properties. The 4.165 at .040 thick is probably the one you want unless you wait until you pull the head and see exactly what is on the engine now. I'd also use ARP hardware wherever I could. You might run a compression check and leak down test to check all conditions before disassembly.