8 3/4 Yoke Issues, U-Bolts? Big Straps?

yep... until 74.
I sold my 74 W100 Shortbox a few years back but dont recall which ujoints it took.
Do you have the trunion eliminator for your 833 ?
I just bought one for a 1330 joint with plans to run it behind my 408 W2 Swinger.
I wanted the low first gear of the early trany and liked the notion I could pull the shaft without gear oil pouring everywhere.
But I ended up using a later model trany.