I don't know my vintage parts well.
Are your 3 pins 5/8" dia? Most pavement sprint cars are running 3 5/8's studs and nuts on LF tires, and any that have the single nut squash plate setup typical only run 3 studs on LF/RF. I can't think your braking, corner force would be greater than anything at Anderson/Winchester.
Quite a few crown cars run the same setup. We typically see cracking on RF wheel centers before any deformation of locating holes.
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