Bigger valves in 302 heads?

I think it's counterproductive on a high RPM head, unless you are into it for your own bowl, pocket, guide grinding, etc. They can make HP, but it depends on how much work you want to do. If you are paying someone else to do this, as stated above, it's not worth it on high RPM to run a 302 runner casting, untouched ports and big valves.