The butt meter did not pick-up any difference between stock ignition and msd 6 box. I've a mild performance 440, and I've run both style ignitions. I purchased the msd in 2000, and I can't afford the price of a new msd. So it basically came down to economics. I'm recently retired, so I don't have the disposable cash that I use to have. Thanks for all the input.
FYI- alternator is a dual feed.