I was taught that the lobe separation angles affect the power band, close LSA make more power below 6000 to 7000 RPM and wider affects it above 5000 RPM on N/A motors.
Also 4 speed cars wider and automatic cars closer works well for me, Pro Stock are suppose to be using 118 to 120 LSA, maybe not shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)