Whether you need race fuel or not is dependant upon your compression and partly by timing. With 20cc domes, you may or may not need it, depending upon your elevation.
Run a compression check. If it's over 160 with your timing, I'd run 100 octane, if its 155, then you shouldn't have a problem, but it wouldn't be a bad idea. If it's much over 160, then you might wanna run 104 or higher. That's the rule of thumb I go by. There are some that may run 165 and +4 timing, and use 93. They may not have a problem, but it's too close to me, one hot day or an air leak with lean jetting could be the difference of blowing your piston into bits... just my opinion.
Late.
EDIT: I have 160 lbs. and +7 timing. I run 104 w/ 4.5% oxygen. Better safe than sorry.