318 value

I'm some what confused here, I've been reading as much as I can about this and from what I've read 2.02 valves hurt port velocity and that's what I read to get to my goals. The engine will probably never see more than 5,000 rpm's.
Big valves if you want but the 2.02's probably aren't necessary for a mild Teen build. Keep those for 340, 360, and Stroker builds. Port matching and a little massaging should make more difference on a teen build.