Thanks everyone, I was planning to run race fuel all the time but it's a streetcar and I was worried that I might want to drive it futher than my fuel cell would allow. I think I'm going to lower the compression to 11 - 11.5:1 and run a good head so I can have the best of both worlds. The combo is gonna be a BBC 496 (4.31x4.25), 11 - 11.5:1, 280/284@50 .722"/.722" cam. I think that cam will put me around 175psi cranking with 11.5:1 static. What heads would you reccomend for best performance and will this be ok for pumpgas?