I bought one of those sheets a while back. I was unimpressed with the overall accuracy of the appearance and the fonts compared to the original stickers. I don't know enough to help with the numbers, a master parts catalog would probably be the best to cross reference. Even then, I'm not sure where the two letter codes were captured besides a build sheet.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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