To this day, I cannot recollect any story about a 350/370 with spacers failing during track use. I can recollect many stories about them holding up just fine.
While I personally feel quality bolt-on spacers (like H&R) are perfectly fine for track use, I can understand why people would rather prefer the stud-replacement type.
I personally run stud-replacement in the front and bolt-on in the rear. Had bolt-ons for my 350 with over 100k miles for spirited driving (but not track use). No problems whatsoever.
Either way, neither spacer option compares with a proper wheel offset setup that bolts directly to the hub.
Best of luck!
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