In the late 70's, Bruce Crower developed a 14-1 compression 350 Chevy engine that ran on pump gas. It was featured in either Car craft or Hot Rod. His company, Crower, manufactured a special camshaft to offset the high compression to be able to run the lower grade pump gas instead of racing fuel. The cam had a 114° LSA to be able to do this. The power results were about the same as if it were a true pump gas engine with 9-1 compression with the same cam with a tighter LSA, not much difference HP wise. So, in a nutshell, if you build a purpose built high compression engine to yield maximum output, you will need racing fuel, because all your components will be tailored for that purpose. Having a high compression engine that will allow you to truly run pump gas, should suggest that your parts selection isn't matched or optimized significantly enough for the engine to recognize there is a need for the better fuel, and you wont be getting any real added benefits by using high compression to start with. If your engine was purpose built as a dirt track racing engine as you suggested,its likely, its built for nothing else but racing, and will more than likely not be suited for pump gas.
