Road test complete, seems more responsive but top end on highway is still less than before I installed headers (kinda juggling 2 threads here) so it dawned on me that since it was maxing out 60-65 mph at high RPM I should run the vacuum advance and sure enough I could tell an improvement, got up to 70 probably could've gotten a couple more mph.
HOWEVER while tearing down the other two 1940's I broke one of the idle mix screws, so now I'll either go with my 1100 as my third carb or find another throttle body for the 1940 (I made a mess trying to extract the rest of the screw).
I could put the 1100(SCV) as the center carb but I'd rather keep the vacuum advance on the middle carb...or does it matter? The outer carbs won't kick in until high RPM so does it matter which carb feeds the vacuum to the dizzy?