318 heads cant firgure out the cc on the head

If rebuilding, What pistons are you gonna run if something like KB 167 and zero decked, unless you want 10:1 CR your gonna need open chamber heads. If a stock type piston your gonna need closed chamber and thin gasket and milling to get a decent CR like 9:1. If going with stock replacements find a compression pin height of 1.741" it will make it easier to get 9:1. I'd go KB's zeroed with 360 heads with a little milling and thin gasket to get 9:1.