On a side note, some of the turbo ricer boys are using the .020 copper head shims (Felpro 8553SP in this case) with copper cote on both sides and high performance head gaskets without any problems at over 15 pounds of boost. A set with some Felpro 521 SD gaskets
https://www.oreillyauto.com/detail/...1/automotive-truck-1985-dodge-d150-pickup-rwd would put you at 16.9cc’s, which should drop you to 9:1.
