The change may take you from "beyond the ragged edge" to the ragged edge. With a moderate performance cam, I always figured 9.5 was max with iron heads and little to no quench. You are higher than that "rule of thumb" with your current setup. With Al heads, 10.5 is max. You would be right at that figure with better quench to help.

The upgrade to Al heads/10.5 CR would help but enough? I don't know. If you could use a small dish to get in the low 10's I would say no problem.