I would ask around before you trash-can that Vertex Magneto. Those things were state-of-the-art before the Bosch 009 came along and were really well made. They also put out a helluva lot of voltage, like 60,000+ volts! I say check the shaft for side play and if it's tight, run it. I ran a Kong magneto on my '46 flathead V8 and it was one potent ignition system. Vertex had about the same reputation, but ask on the Samba what people think of them before you decide.