Just so I'm 100% clear on an 8 3/4 swap!!!

Sdriche said
And no issues swapping to a 68?

No issues other than the normal 7.25 to 8.75 quirks: U joint size may differ, use the shock plates and U bolts from the 8.75, and driveshaft needs to be ~1.5" shorter. Knowing that, it bolts right in.