Stripped and cleaned the rear engine cases and measured the main bearing bores today. The bores are hammered so will require a sleeve insert.The drive side is from a 1960 T120 and since the case mating numbers don't match I can only guess from the casting number on the timing side as to what year that may be. Good thing is that both cases use the same bearings. Some pre-1962 engines used smaller bearings which wouldn't be strong enough for a load of nitro.
The pre 62s had two different cranks. One was a 3 piece, bolted together and one that was a solid casting. I found two of them so they will be cleaned, measured and magnifluxed to makes sure there are no stress fractures. If all is good they will be sent out for regrinding the rod journals.