CIS in great condition with all components in working order is a great system. Once things start to fail, the NLA parts cost to rebuild and replace easily starts to approach the cost of the Bitz kit. $450 or more for the air box, a few more hundred for each of the WUR, AAR, and others, many more hundreds for the FD. New injectors, seals and sleeves etc add up fast.
Gauge set, CO tester. Etc, etc, you get the idea.
For your '82 engine you will need to make sure all the O2 Jetronic controls and wiring come with the CIS. (Lambda)