I have a 87 t.fresh built gn1 crank,alum champion heads,intake,studded lower and upper,120lb inj,78mm turbo,meth kit.holley hp computer..just got it running again ,tuner is having issues...this is a car I plan to put several different tunes in for different fuels and power,but mainly will be a 93 octane pump gas with meth inj street car..how much boost should I expect to give it on pump gas,and could I go with my 88 billet turbo and still get it to make boost quickly on the street.just trying to get some advice.