I had to move the front upper shock mounts to add power steering to my 59". I used grade 8 hardware and torqued everything to spec for the size bolts I used. I don't really see an issue, I know that the original rivets are the preferred method but if you use quality bolts there shouldn't be a problem.
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Shock Mount Installed R.jpg (117.47 KB, 152 downloads)
Shock Mount

~ Craig
1958 Viking 4400
"The Book of Thor"
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1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane