The original wire to the coil was an beige, may be brown by now, wire. It's called a resistance wire and reduced the voltage to coil so it wouldn't burn up the points so quickly. The insulation is different than the other wires, like a woven fabric. Easiest is go to an auto parts store and buy some new connectors to plug into the connector block on the end of the engine harness. Remove the old wire and use a standard, red, 12g automotive wire to run 12v to the new coil.
The original wire to starter, same harness, was purple. Believe it was also 12g. The end of that wire, about a foot or so if its still there, may be red. The insulation will be a little different than standard. I believe it was to with stand the heat in that area above the starter behind the exhaust manifold.
If there is a yellow wire wrapped in that harness, it went from the R terminal on the starter solenoid back to the + on the ignition coil. It supplied a full 12v to the coil will starting. You won't need it because you will be feeding the coil a full 12v all the time with the new wire.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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