HEI wire from GM Coil to Chrysler Distributor ? Does it exist?

Looks like you are fooling w/ some early GM parts. I would switch to a 85-95 GM "external coil". It has a standard HV terminal. If you also use their 8-pin HEI module, it connects w/ a factory GM cable w/ sealed connectors. Cheap at any junkyard, or buy TrailBeast's kitted set. Also gives the option of commanding spark timing from an engine controller like Holley Commander 950.