You should be fine running the 100LL. I've used it in several cars (including my BDR) with no ill effects. Smells good too.
Much cheaper than Race fuel which can easily run over $12 per gal depending on the octane rating or if unleaded.
You don't really need it with a street crate motor under 11:1.
But this site will help you locate Ethanol free gas stations in your state.
https://www.pure-gas.org/