Just ask for a 1975 GM full size car module. It will be a 4 pin, you can see it on my firewall under the hood hinge here
You need a heatsink, I used a spare I had from a 97 LT-1 swap. The module can require 10+ amps so a small battery wouldn't last long. 12v conversion is a must.
-OR- convert a slant 6 POINT distributor and keep the points with 6v.
I don't like the MOPAR units as they still need that troublesome ballast resistor
I use my supply of Pertronix coils I save from the failed units I throw away. Or use an early 80's Mopar Lean Burn coil. Some canister coils don't like 12v running to them all the time. You can also change to an e-coil and increase your plug gap to .055 or so if you wish, I don't see the need and I don't like the look.
You MUST change to resistor plugs and wires
Been running it for several thousand miles now with zero issues.