Judging by the pics of the baseplate, the primary slots look rather long. My guess is....... there is too much showing after you opened the blades more to change the idle speed from 1100 to 1400.
Have you qualified any of the other low speed concerns? Still starts good? Idles any better/worse in gear?
Also, what is the idle speed in gear, and what is the vacuum reading idling in gear?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
