Adjustable modulators will provide the tuner with a small range of adjustment and it will for the most part only effect light part throttle operation. With heavy and full throttle the vacuum falls off enough that the modulator no longer becomes a player, very similar to a distributor vacuum advance.
Most will provide an adjustment range of about 3-5 mph from one end to the other. Make very small adjustments and drive the vehicle after each one till you get it dialed in where you want it......Cliff
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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),
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