Max rpm 360 magnum ???

Use a rev limiter. The MSD #83647 HEI module comes with an adjustable rev limiter. If you use a Chrys elec dist, you can use a GM HEI module with it. The benefit of the MSD module is it has the built in RL [ no extra wires or boxes ] plus it switches 50% more primary coil current for a hotter spark. More BANG [ pun intended ] for the buck!