[Excaliber]

2nd generation 6AL2, "programable", nice. Still, there playing catch up with Mallory. The second generation 6AL2 is a "box", you also need a distributor. Mallory has a one stop solution, a stand alone programable distributor with vaccum advance capability.

It's time to get out the lap top, plug in and plot your timing values. Using the MAP sensor in the MSD box to simulate a vacuum advance unit could be especially problematic. But in either case (Mallory or MSD), it's a valid solution for the delima of weights and springs and limiters. Risky, but valid.