Just use a water methanol mix sprayed into the inlet of the carb at a determined boost level this is not as good as an intercooler but will help with detonation.Its quite a simple system to set up really just install another washer bottle a spray and a hobbs pressure switch.
Mate of mine ran this set up on a bog stock 186 in a torana with a draw through su carb and vl turbo and it realed off a 13.2et not to bad in my opinion.