Front clip from late model

[66 lwb cs]

I was wondering how late a model of truck you can swap in the front clip from onto a 66 C20? I saw another thread talking about using a 73 clip to get the discsand the 5 lug setup as well as the control arms for using C10 lowering gear, and how it was a bolt in affair so was wondering how late a generation clip you can just bolt under one of the older trucks 80's 90's 2000's are they all basiclally the same set up? Also any hints on the rear axle swap would be appreciated as well did a search but didn't find this question answered. Thanks in advance.