I just swapped a '92 ZF into my '86 CC.
The turbo up-pipe was the worst part of the whole thing, and it wasn't too bad. Looks like you don't have a turbo to deal with, so it should be pretty easy.
Be sure to grab the ZF-5 crossmember and 'wings' that bolt to the frame. I had to drill two holes, but the rest lined up perfectly. Truck is much better to drive now and though I have not tested it I am sure it gets better MPG too.