The TKO is not a T5 or even very similar. It's closer to an iron Toploader than a T5.
If this 463 is going in a 1500lb TBucket with rock hard 50's vintage 6.00-16 bias plys it could live a long life. If it's going in the 64 Galaxie 9 passenger wagon discussed above then i'd give it 15 minutes total.
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