The definitive list...

JDMopar said

Seems like I remember someone saying the old timey big starters will sometimes hit the rear boss that the Magnum mid mounts mounted to.

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There was a boss on my Magnum right where the mini starter mounted. I had to grind it off to get the starter to fit flush.

Also had to grind some of the truck mount boss for clearance for the power steering gear. But a truck may have more room.