Here's what I did. My '46 has a '61 261, original bell housing, T-5 trans, open drive line, diff gears are 3:08 (I know to high geared but it was free), donor rear end came from a '65 Chev truck, 6 lug.
If you do the center section swap you will need to change the pivot rear axle, cut off original rear axle brackets for solid mounts. Not a difficult swap.
Best of luck
Last edited by JiMerit Boltr#43; 05/25/2023 5:13 PM.