70 k/20 14 bolt swap questions and concerns

[collin70k/20]

Im sure this question was asked plenty of times. But i have a 1970 k20 chevy pickup with eaton ho52. Well today is decided to take a crap on me. so the 14 bolt dually rear i have is going in this weekend. (pretty sure it has 11.5 ringear). Any how i know you have to cut the spring perches and shock mounts. thats no problem. My one concern is will the back driveshaft on the eaton work on the 14 bolt? Any other questions, pointers, or advice is greatly appreciated thanks Collin.