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I have fooled around with a lot of slant 6's over the years and never had problems with the starter meshing with the ring gear. I would take off the dust cover on the bottom of the bell housing and look with a flashlight to see what is wrong with the starter/ring gear alignment. You don't mention if this is a stick or automatic. If it has been apart, could things have been put back together wrong? Or could the ring gear have slipped back somehow? If so, it is a grenade waiting to blow. It seems to me that almost all the Chrysler gear reduction starters will interchange and that a V8 starter will work on a slant 6. I have never heard of shimming a Chrysler starter, which goes straight back into a machined hole, unlike the GM method of the bolts going perpendicular to the crankshaft. My Chevys have often needed shims to get the clearance right between the starter gear and ring gear. Looking at the ruined starters might give a clue as to what the problem is. What goes bad? And is the ring gear all chewed up now? Another thought: Chrysler bell housings and their alignment with the crankshaft is set by the dowel pins in the back of the block. I have had some trouble in getting this exact alignment when changing slant 6 engines, which produces a combination that will wear out a pilot bushing in a couple of thousand miles. Chrysler parts sells a kit with offset dowel pins to cure this problem. But to get it right, you have to remove the old dowel pins and use a dial indicator on the flywheel indexing on the large hole in the back of the bellhousing, or I suppose, the front pump opening in an automatic transmission case. The center of the crank should be exactly centered in the opening and this might require some moving around of the bellhousing. It is a heck of a lot easier to do this with the engine out of the vehicle. But that is an unusual problem and I would expect other problems, such as bad shifting or unusual wear of the pilot bushing or transmission bearings to show up rather than problems with the starter. Good luck figuring out the misalignment.
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