anyone with jetting 38 pj carbs vs say 39 pwk carbs chime in, it seems the pjs like to be jetted richer then pwks on the same kind of motor? It seems we are way bigger jet wise then we are with the pwks on the same size moter. 3 421s with about the same jetting with 39 pwks vs 10-15 jet sizes bigger with the 38pjs....