Carl,
315 Hoosier R6s work pretty well up front on 11 inch rims. Watch the brake lines as it can be close at full lock. I played with some clamps and tape to avoid rubbing the brake lines and it worked OK.
FYI, the 11 x 18 Forgelines I had rubbed, the 11 x 18 SSR's did not. You will want some camber, say 2.5 or so negative up front.
Would not try running 12's up front as they can stick out quite a bit depending on the offset. One of our guys tried them on his new ACR and he could not lower the car to smooth track height without rubbing.
As for running 315's on 10 inch front rims, don't. You'd be better off with 295's. One of our guys tried this too and lost his left front tire at Willow after only a few sessions. Too much tire for the 10 inch rim, especially as hard as you will be pushing it.
Let me know when you'll be back at the track,
Dan