What ignition system will do me justice??

MSD 6AL here as well. 520 lift in my .30 over 440 with an 850 Holley dbl pumper and she screams. Go with it. You'll never regret it. LOL, in fact, if you can wait til race season is over I'll sell ya mine. I'm stroking my 440 and upgrading to a 7AL3 over the winter.