Does anyone know where to get some high performance head gaskets for a high perfomance Northstar? Like some copper or stainless steal headgaskets?

If you can, try to get a copy of the Motorsports Aurora V8 Handbook P/N 24502570 I believe it is still avalible thru GM. Back before GM killed Oldsmobile they RACED this engine and it was not the 4.0 so try Olds IMSA and USAC (indy 500) part sites Hope it helps