pizzaguy did a detailed write-up, see post # 26 in this thread :
https://www.crossfireforum.org/forum...tml#post859081

On a 1-10 difficulty scale, I'd say about a 4.
I took mine out once to see if I could fit an under drive pulley from latemodel21 ( didn't work BTW ) and I spent maybe 2 hours out and back in.