The first pic looks to be the engine wiring harness. Yes the purple wire goes to the S stud on the starter. Orange goes to heater blower motor. Blue drops down on drivers side and goes to oil pressure sender, above oil filter. Broken red wire may have been someone's attempt to replace the original resistive wire to run an HEI. Can you see where it use to go in the connector?
Second pic looks like the forward light harness. Goes to headlights, parking lamps, etc. Also feeds power to the fuse block.
Third pic, brown wire looks like the one that goes to the brake proportioning valve, on the frame below the mater cylinder.
Yes, power to the HEI plugs into the BATT terminal on the distributor.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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