69 Z10 Ignition problem/ electrical?

[Pantera]

The safe way is to get a ceramic ballast resister (ala 57 chev) and put it inline in place of the defective hot wire and run it from the wire harness outlet to your coil.

Your coil actually runs on 9v. to keep from destroying the points. If you run 12v very long they (your points) will transfer metal (pit or burn) and will not last too long.

PS: be sure to change the condenser too.

An experience I recently had, with regard to HEI distributor use, in my 69 Nova with big block, was having to cut the original resistance wire out of my original harness and using a larger guage wire to handle the "draw". My old resistance wire was causing the same problem as you desribed. No problems afterward, and the engine seems to be running better and the cam seems to be "hitting" harder. I guess the spark has been strenthened.