1993 c3500 6.5 to 8.1 swap ?

[I_Wanna_Go_Fast]

Goodmorning fellas
I've got a 1993 chevy c3500 crew cab dually with a 6.5 detroit/4L80E. The truck came out of Texas, NO RUST. I really only use it to pull my 42ft gooseneck race trailer with a 72 c10 drag truck. Ive grown quite fond of the 93 and rather than spending $60k+ on a new truck Ive been thinking about swapping from the 6.5/4L80E to an 8.1/Allison combo to gain some power and reliability. Don't get me wrong the 6.5 runs well but its a dog and from what I understand the bottom end is a ticking time bomb.
Just curious if any of you have done this, and if you have what did it entail?

Any help would be greatly appreciated, These forums have been a godsend and have yet to let me down.

Thanks in advance!