you need a vacuum guage and hook it up to the manifold vacuum... like where the power brakes are hooked too...

you do now want ported vacuum...like what the vacuum advance on the distributor is hooked up too..

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)