General Slant and Gas/Octane ???

I get my gas from the same place all the time. In the south it is called RaceTrack. They are pretty large here.

1968FormualS340 I don't really understand what you are saying. My car runs fine on both mid and regular but the power band changes slightly.

What I was trying to find out was if I may have my timing/carburetor or something off would it cause the symptoms I am seeing.