This is not answering the op's question and I hope I'm not hijacking this post. But...if the BH alignment was off, we would remove the dowels, align the housing and drill and ream for oversized dowels. This was on big Cummins powered trucks, never tried small block.
That would be tough to do with the engine in the car, especially since the dowel holes in the SB chrysler bellhousings are blind. If the dowel pin holes in the bellhousing are tore up, we repair them with a steel bushing.