Truck Dana 60

getting my truck Dana 60 ready for my dart
So far things are looking pretty straight forward should have done this a long time ago
But I do have one question that is a little fuzzy to me
Why can't I center the chunk
I understand the u-joint needs a angle to spin the needles but
That can be done with the pinion angle
Also the engine and trans are not in the center of the engine compartment
Thanks

View attachment 1715101056
Man my shop looks like crap