[DavesRide]

Originally Posted by poorboy

You want it hooked to a port that increases the vac as the rpm's go up. If you hook it to a manifold vac port it will be at constant full advance in the timing. Just start the motor and use a vac gauge or hold your finger over the port. Raise the rpm it should increase the vac as you raise the rpm.

Go with poorboy's advice. The only port that has vacumm during acceleration it above the throttle plate. Look for a port above throttle plates and hook it up to the distributor vac advance. I know the ones below have no vac on accel from my experience with old truck wipers. Rememberwhen?