Toss the PV & square jet accordingly , only the motor can tell you what size jetting for that carb , it all depends on how the motor is set up , going up in jet sometimes won't net any gains due to air speed having already been maxed out , messing with HSB/emulsion circuit can net some gains , i've always wondered why holley ships these carbs 88 square jet with two power valves , they could @ least supply jet extensions to the rear , but they don't.