with those heads your CR is about 11.2:1, and would handle the next step up cam - although I would want a 106 duration, and lose the Air Gap for a Victor high rise.
I would also swap out those gears for a set of 410's or 488's.
I run the Comp roller 516/535 with almost the same set-up you have in my modified ( with the changes above ) running a 2 speed direct drive tranny & it runs up front