Drive train swap from 1980 to 69 K20 ???

[mark69k20]

Thanks for reading! Sorry about the pics I lost front axel and other good ones.

I have the option to buy a 1980 chevy custom deluxe 10 -doner truck w/ 32k on it,CHEAP(body is toast). I believe it has 10 bolt front, 12 bolt rear, NP205, 350Ci ,Autotrans T350, power brakes, power steering...

I want to swap all of it into my 69 K20 currently: front Dana 44 closed knuckle -drum brake, rear H052, Rockwell 221 transfer case, 307ci, 3 speed, power nothing

both trucks are long beds.

How much differnece is the track width between the two years?
Will the axels swap over w/o pain?
Transfer case support?
driveshaft lengths?
Brake booster/master swap?
Power steering swap?(THIS is a big one)

This upgrade will give me, parts for my other 69K20, a better gear ratio(not 4.56s) front disk brakes, parts availability, more power, etc... O yeah this will be daily driver, I know everyone says the 10 bolt is crap but I won't be beating it...much!
Thanks, this site rocks!