Generally you can run race fuel a tad leaner than pump gas, because the ethanol in pump gas requires more air to burn (making the engine run lean).
Another point to make is that you can get closer to stoichiometric ratio with race fuel because it has less tendency to detonate.
With pump gas you need to jet fat to reduce detonation problems.
Just give her a run with straight race fuel and see what the plug looks like, if it looks good then keep it there.
If you want to tune it to the T, you have the option to, but for overall performance and longevity, jetting is best left on the safe side.