Why does this car need to be updated to a 2019 spec for a very simple starter sytem? Consider how much are you going to be driving this car? Not much by most. Go to O'Rileys, spend $54.00 for a 72 Mustang Starter. It fits guaranteed, no modifications needed, and it will most likely outlive your ownership. Then run a ground cable/strap from the starter stud to under a motor mount nut. Solved my hot start problem.
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