Thank's for all the input guy's! I was down at my local N.A.P.A. store, picking one of the employee's brains. This guy is the happy owner of a 1970 440 Challenger R/T. He run's M.S.D. but, looked at mine and said I have Taylor's in there right now. "Keep them, they're in good shape! And they don't break down." I was concerned with them because, when changing my spark plug's over to N.G.K. Platnum's, I pulled one of the end's off. He set me up with some spare end's and told me to be more careful. Ooop's, I should have known better :dupe:Have a great day; Pat