I would love to help, but unfortunately my extreme jealousy is blocking any info I would normally share....
Haha, seriously though, congrats on finding that tractor. She's a beaut.
Anyway, that tractor should've had a C series Onan in it I believe, like a CCKB or what have you. Judging by the pictures I'd say the reason the shroud was cut up is because of that solenoid-shift starter. I don't think that is an original style starter and that would be why the shroud was clearanced, meaning that engine most likely is the original mill.
Glad to hear you got it to run, I'd be sure to check the valve clearances on that before it goes back in the tractor, as they need to be checked fairly regularly on those Onans.
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