Dragged this home today

[gmc684x4]

Debating how to use this frame do I add get the rear welded back up
one Po cut the frame down shorter then a short box dimensions
I measure 25 Inches rear axle cl to end of frame my understanding is it should be 33.50 inches for a short box

are there much difference in 1/2 to 3/4 frames I have two 69 c20 leaf spring trucks I can swap a arms and rear diff with control arm cross member

A quick look locating the trailing arm cross member should be easy using the front box mount hole as the share the same rivits