'302' Combustion chamber volume?

After a while of dreaming of a 318/390 stroker with alum. heads and all that good stuff I am realizing that I will either build a monster engine and live at home for years longer or use the 302 heads I have lying around and build a budget engine but still push 400hp. So, I am looking at building a more mild engine with some warmed up 302s and am needing to know the size of the combustion chambers over other 318 heads with open chambers so I can select the right piston. I have been looking at the KB399 pistons. I would like over 10:1 compression if possible. Also, Mancini has Eagle I-beam rods on for $240 instead of $260, is that a decent price?