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The 71 series was the only one to have a solid cast v12 block.... The 92 series was two v6 blocks. I don't know if they ever made a 12v-53, I've never seen one but it would have been two v6 blocks if they did. The largest 92 series was a 16v-92 (two 8v blocks) and the largest 71 series was the...

I think you could stuff a 12v71 into an 800-series 5 ton, but it will not be a simple drop in job. An easy fit that matches the original engines' capabilities would be a 6v-53 or a 6-71. NAPCO used to offer 6v-53 conversion kits for 5 tons (and 4-53 kits for deuces). The 12v is much wider...