The factory u-joint is a 7290 series. It is an inside clip, 1 1/8" diameter cap, 2 5/8" across.
The 1350 is an outside clip, 1 3/16" diameter cap, 3 5/8" across.
1350 Dana 60 29 spline yokes are readily available.
I put a d70 1410 yolk on my D60 and used the front section of a 2 piece rear drive shaft(already had 1410 on both ends and the slip portion, just have to pay for a shorten and rebalance)
Glad you got it worked out.