Turbo....

Keep it under 9 psi boost. As I have researched, 9 psi is the limit a stock distributor timing profile can take, what a boost referenced fuel pump can generate and not have to use an intercooler. Intercooler is a plus on any turbo but the higher boost levels really elevate the charge temperature. For a slant and crappy gas, 9:1 would be your best bet..you wanna keep it together long enough to drive it. Your detonation will dictate how far you dare take your compression or boost level. compression is alot harder to adjust.