to tweak your compression you can use a thinner Cometic gasket, comes down to piston deck height . I have cometic 040s on now , but use cometic 027s on my 440ci stock block . Have used 270 heads on both .
As for which head , they seem rated per spring/cam type . I bought the hyd roller/solid ft head .
As for rockers if buying new buy the HS (?) specific for these heads . I am running Crane Golds 1.5s , wish they were still available in the 1.6 .

Tex