Quick spot weld question

I have my 72 dart on the rotisserie and while removing the undercoating I found a few spot welds where the floor sections meet that are popped.
My question is, should I fully weld these seams to add just a little more rigidity to the body, or just drill the old weld and reweld in the spots. The car is getting a warmed 383 and MAYBE a manual trans.


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