Do NOT disconnect the link from the pull-off up to the secondaries. I see folks recommending this all the time and it will not work. The pull-off is there to provide smooth transition and it must be timed correctly for this to happen. Problem is that dating back at least 20 years now the pull-offs being supplies do not have the correct springs in them nor the correct restriction in the orifice so they work correctly. Take the white plastic pull-offs currently being supplied for the early 67-70 Q-jets. The spring in them requres 14" vacuum to apply the pull-off, factory spec is 5"-6".
I've tried to get the manufacturer's to correct this issue but it goes on deaf ears. I used to modify them in house but currently sending them out to be "rebuilt" with the correct spring and orifice in them.
All the pull-offs I sell are modified to work correctly, next to nothing coming from the manufacturers is worth two squirts of duck poop right out of the box......
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https://cliffshighperformance.com/
73 Ventura,
SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),