Back before I could afford a HEMI, I built like, 12 BB Chevys. Always used the "Bible", How to Build a Big Block Chevy. I wore out the first one. It often quoted Chevy engineers. They RECOMMENDED AV gas if racing gas was not available. I ran it for years, (worked at the airport and took flying lessons). Never had a problem in 12:1 L-88 and LS7s.