Mine fits a t400 just fine or could put a stick behind it...I have it mounted to original block dowels plus I doweled the plate for t400. My adapter doesnt have to be used as a mid plate.
The adapter is doweled to the original block dowels. The starter is piloted to the adapter so there is no shimming once the pilot plate is located and welded in place. The adapter has separate dowels(for modern pattern) to keep the bell indexed. I can completely dis-assemble and re-assemble with no realignment issues or shimming if I change the starter. Have room for a clutch pivot/pivot ball too.
Good luck with your starter mount plan...I almost did similar...but felt having a piloted starter like most non GM cars and early Pontiacs was a better way to go. The pilot takes quite a bit of loading off the bolts.
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