I have a 1983 Shovelhead. Approximately 7000 miles since rebuilding it. I have cast pistons. Would it hurt to put a small amount of nitrous to it occasionally? Also, would I get the good flame travel if I dual-plugged it? It's got a high four ignition and an Andrew's AB cam and it's bored 30 over with an S&S Super E. I'm trying to get good flame travel in a hemi head. Any suggestions would be appreciated. Can't afford an Evo or a Twin Cam.