LD340 intake is it still good after this modification

I did this same mod to my 340 duster with .500" lift cam, 9.7 comp with a thermoqaud and it was incredible what a difference it made. Car ran consistent 12.20's at 108 mph. Before this mod the car fell on it's face at about 4800 rpm.

Did you cut it all the way down or leave the 3/8 to 1/2 inch that they recommend?