Doug's headers and mini-starters

As long as you've got room on the backside of the bellhousing for a bolt head, you could drill it out to the same size as the unthreaded hole in the starter and put the bolt in bassakwards from what it's always been.
If I drilled the top starter bolt through it would pass right through one of the pivot bolt holes. The shape on the backside doesn't look compatible with a bolt hole and no way to get in there to grind it flat either. So that's a no-go.

It successfully bolts onto a slant 6.
If it doesn't hit on the block or other parts it will bolt right onto any Mopar then, so you weren't wrong to think it would fit an LA or RB.

Moral of the story, those starters come different, if the fit is tight or doesn’t work, do what I did. Another one might work.
I'm going to take the starter I've got with me to see if there is anything different on the shelf in a mini-starter that I don't have to use a drill to make it work.