1960 to 1972 front axle swap

[Blue Ox]

I know similar topics have been discussed elsewhere around here. Maybe it's just me... but I'm not coming away with a good sense of what the interchangeability (is that a word?) of early and late model front axles is.

I have a 1960 GMC 3/4-ton (K1502) that I'm fixing up. Like a lot of folks, I'd like to upgrade to disc brakes on the front, but I have the closed-knuckle front end and it's looking like going with a later model axle is going to be the most efficient method.

I have a line on a complete front axle from a 1972 K20 (correct gear ratio and everything). Can anyone give me a clear summary of what I can expect to have to modify (if anything) in order to get that to work?

I'm not worried about modifying the brake system to work. I can figure that out. I'm just wondering about the physical compatibility between the two axles (spring perch locations, any offset in the location of the diff housing, etc.).

Thanks!