With a 3 on the tree, I would be looking for a 3.73 out of a '67-'70 half ton truck. Its a 12 bolt rear end. You will have to weld on some spring perches.
Any ratio numerically less in number (like say, a 3.55) would be a sluggish in first gear under any kind of an incline.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission