When I run into this situation, I do the following: I oversize the bolt holes in the block to install hollow dowels (like the ones you find in bellhousing mountings) & oversize the holes in the starter to the same size & install the hollow dowels. I then get an aftermarket starter from my electrical vendor (not thru forklift channels) that fits Chevy delivery vans that's a gear reduction style with no nose cone.

I've done this twice & so far so good- no call backs. One was in a low use Clark- the other was a high use Hyster.