If you grab a pre 85 14 bolt FF you can swap out your drums to disc brakes for about the same as rebuilding your entire drum brakes.
your drive shaft wont be an issue on any axle swap upgrade with the 4 inch lift
if you swap in that 95 you really need to be careful rewelding those spring perches, if you intend on driving down the highway with it. IMHO your better off buying new perches, for alignment reasons.
That being said you still need to deal with your front axle gearing. so I think your better off just spending some time and hunting down an old donor truck that has both axles you want. and maybe youll get some other usable goodies from your donor truck as well.
once upon a time I found an 80' GM 3/4 ton. cut the entire body off of it with a sawzall. lol after sandblasting and coating the entire frame I swapped over an 86 2wd body, modified the transmission tunnel and cut the front frame to accept the 81-87 bumper and I even moved the engine crossmember back to fit in a 4.3 v6.
the v6 was a bad idea. but it was all very doable. that's what I love about these old trucks, you can make em just about any way you please !
I would love to do that again if I had time and space.