Demon NO Go

Are you running power brakes, if so disconnect the large vacuum line going from the intake to the booster pot on the brakes and plug the line. This might be where your vacuum is going if the diaphragm in the booster has a hole in it. I wouldn't worry about the plugs just yet until you're ready to go for a blast down the highway. Before you do put in a new set then check them immediately afterwards, 14 are a little hot and you may find you need to go down to 12's.

Terry