Relocate Solenoid Slant 6 1965 Barracuda

Pardon my ignorance, but I've owned 63, 65, 66 and 67 slant sixes, one manual and three automatics, and I've never seen a starter like that on a slant six. Ones I've had were just regular Chrysler Corp starters, interchangeable with small and big block V8s. What???

What about running a lightweight modern aluminum starter? My 63:

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