I think I solved my own quandry. I will put a jeep tranny and bellhousing up to the Willys engine and connect to OC3 input.
It helps to read other subjects such as auxillary transmissions.
Thanks everyone
4WD Jeeps have the transfer case mounted to the back of the trans, maybe a Post Office 2WD jeep could be a source for a tranny w/o the transfer case.