Both door jams have a spot, under drivers feet, at bottom of windshield on body not fender.
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You just named every fox body trouble spot. Have you checked the subframe at the base of the front shock towers?
This sounds like a lot more than just a “couple patches welded in”
I'm not far from you and pass thru Caledon daily - I could stop by and have a look one day thru the week in the evening