Nice thing about vehicles that old, run a fused hot wire with a switch to the coil and a new set of points and your engine electrical is done. Put on a one wire delco remy alternator and your charging system is done, then you only have to worry about your lights if you plan on driving at night, (blinkers were not required until ‘54).
Remember now: Those old vehicles were 6-volt systems. Where will you find a 6-volt alternator? Cars were already 12-volt long before alternators showed up.
When I did my '51 International, I wanted it looking sort of like a tradesman's work truck, but it also had to be practical and safe. The whole electrical system except for the instruments was converted to 12 volt. I put a Ford 300 inline 6 in in it, which already had the 12V alternator and starter and ignition. 12 volt lights throughout, converting the front park lights to a dual-filament bulb socket for turn signals. The rear lights were just off the shelf trailer lights. I found a turn signal switch from an old conversion kit, and built a turn signal system, complete with a relay to fire 4-way flashers. For the coolant temp and fuel level gauges, which ran on 7 volts (nominal 6-volt charging value) I built a regulator using an LM117T chip and a couple of resistors to feed them the 7 volts. The oil pressure was mechanical, the ammeter did not care what the voltage was, only the amperage passing through it.
I installed seat belts and shoulder harnesses. I installed a dual brake master cylinder from a Dodge van and had a dual braking system.
The Ford's 3-speed transmission used a much different shifting affair than the International's so I built that too. Used the original shift lever and column.
The three-on-the-tree was fun. Once in a while I'd give flight students a ride back to campus if I was going into town, and their reactions were priceless. One day I shifted from first to second, and the student said, "What did you just do??" He thought I had changed from Drive to Reverse!
They also thought the vacuum-powered wipers were hilarious.
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