PerTronix help for 195.6 engine

Do you have a cigarette lighter? Check and see if it works with the switch off. If not you can tap into it. By that I mean tap into the wire powering it, not using a lighter plug....  added this just in case....

Then test the cigarette lighter power wire. Should be easy to find, or the radio power wire. You can also go off the RUN terminal of the switch.

Since your car has no fuse block you may want to add one. That will solve a lot of wiring issues, and why I did it on my 63 (which does have a very small fuse block). Most auto parts stores carry a six fuse block in the electric section. Mount that somewhere under the dash and run a wire from the RUN position of the switch to that block. Then all you have to do is push in a fuse and add a wire to the exposed connections to get power. I'd even run the radio and cigarette lighter off that rather than use the in-line fuses (I don't think the lighter has one, but the radio does).  Use the radio or lighter power wire to run a relay (something like a fog light relay) with the relay supplying power to the fuse block straight form the battery (use the battery terminal on the voltage regulator).  That's how I run my auxiliary power block.