[Clyde65]

My experience has been for the 63-66 swaps to 71-72 and also 73-87 1/2 ton, however the 3/4 will be the same.

I would get the upper and lower a-arms ( rebuildable shafts, opp to paint/clean), the spindles and rotors and calipers from the donor

replace the worn parts as needed and bolt them up to your 63-66.

If you swap the whole crossmember, you will have to enlarge a couple holes and if memory serves, the 63-66 have 12 bolts and the 73-87 have 14 for mounting the cross member.

If I am mistaken on the last someone please correct me but I think that is right.