I just took a look at the wiring you drew. That is a total cluster F--k mess. Get rid of the ford solenoid . Your starter has one built in. All I did was run the Positive cable from the trunk to a positive bulk head on the front frame rail and used that as my positive terminal under the hood. Every other wire was left as the car came. I even have the original battery cable going to the starter running from the bulk head.
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