63;409 with a 552 bell housing. I think I need to shim the starter, because I noticed that after kicking the starter the starter drive stays engaged. If I poke a screwdriver it quickly disengages. Looking through various catalogs I see shims but they all look to be for block mounted starters. The various videos all deal with block mounted starters, not bell housing mounted starters. Anyone ever shimmed a bell housing mounted starter?