What is minimum electrical required to start my car?

If you want to try a GM module, here is the diagram:

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NOTE:

Notice the blue "ground" symbol on one of the mounting holes. Look at the back of the module. There is a plastic locating tit you have to cut/ file off so it "lays" flat and you have to mount it flat on something (flat sheet of aluminum) so it has some "heat sink." DO NOT try to run it "in air" you need something for a "sink."

NOTICE the way the distributor is hooked up, showing the "bare" terminal on the dist. connector. This changes the timing if wrong.

I run my car with an HEI, and I also made an "emergency" module, with an HEI module in a box, and a coil. All you need is green clip to ground, yellow to 12V, hook up coil wire to distributor, and off you go

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I WOULD NOT DO THIS JUST YET. You can easily introduce MORE TROUBLE especially since you are inexperienced. I WOULD MAKE some checks of your existing system FIRST

ONE EXAMPLE is "if you have" a bad distributor/ distributor pickup. In that case, wiring up an HEI will not do a damn thing except waste your time and cause more confusion.