1959 Apache 283 Identification

APatche

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Sep 29, 2020
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1959 Chevy Apache 3100
I have a 1959 Chevy Apache 3100 with, what I'm told, is the original 283 engine. While attempting to decode/document everything about the truck, I came across these numbers on the front passengers side of the block; TIOIOD. I have searched everywhere and have asked in other forums with no success in decoding these numbers. Is anyone able to decode them or point me to a location where I can?
 
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