I suggest you visit
Sheldon Browns site to get a grounding in Bottom Brackets.
Taking a
semi-edjumicated stab at it, I'm gonna go with a
68mm square tapered, either 115 or 118mm in length. But I really don't know the speciifcs of the frame so threading and such is just a guess.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.