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Well, I recently had the same problem. Check the MSD and that was not it. Checked the coil it was putting out via the MSD test. The sensor unit inside the distributor, (Mine is a Mallory Unilite) was bad. Darned expensive little item. I think I will always have a spare around to boot.

This things are the most delicate in the chain of the charge. Any power spike or sever variance will indeed play havoc with them. SOmetimes a jump starting or battery charger will whack them as well. I think you can somewhat protect the unit with a power ballast resistor or one step above that is a power conditioner. How effective those are I do not know.

I think a spare coil, rotor, and distributor sensor switch, fanbelt and one or more spark plugs are pretty much (Must haves) in the way of spares.

Hope you find the problem.