Willwren, if you need some higher octane, I know there are several places in your area that sell unleaded racing gasoline even at some gas staions near the Woodburn track.
Another option is to add some fuel octane boost from Klotz. I have used their stuff and it works. It is illegal in santioned racing were you have fuel checks. At one time duirng a match race at the track, I used Klotz Coxoc as an additive and the car gained 2/10'* down the 1/4 mile.
The other guy was trying to figure out how I suddenly gained so much on my car.
The following article talks about the effect of octane boosters:
The link to Klotz is as follows:
I have used the Klotz Coxoc, Octane Booster and the Hitrate gasoline concentrate; they are not cheap, however, they work!!!