68 Canadian GMC 920 4x4 Questions

[Can68GMC]

Recently bought a very original Canadian GMC 3/4 4x4 - in really nice shape. Getting ready to pull the trigger on a resto and I’m struggling with a few things - truck has the original rebuilt 327, HD closed knuckle D44, HO52 rear with factory no spin, SM465 and T221.
There is something to be said in keeping the truck original, but I am seriously thinking of swapping out the frt diff for an open knuckle D44 with disc brakes and swapping out the 221 for a 205. Nothing really wrong with the original kit now, the 221 whines and it would be nice to have some stopping power in the old girl. These trucks are fairly rare (being the Canadian GMC), so would it make more sense for future value in trying to keep it as stock as possible? Or would the upgrades make it more valuable?
If I knew how to post pics, I would, it’s a great color combo with the off white exterior and red CST interior