If all you're looking to do is raise compression, sure the small closed chamber heads will work, but they don't flow well at all... valves are small and intake will be shrouded no matter how much you work the chamber.

There may be other opinions but I think 9 times out of 10 you'd be better off with the heads you've got (unless they're peanut ports?) give up a little compression for a lot more flow...

two cents,

Chris