We did this swap last summer in our 84 Ramcharger. The donor vehicle was a wrecked 96 Dakota. I made the decision early on that we would remove all of the Ramcharger wiring and use the Dakota wiring. That worked out well with only a few modifications necessary, including lengthening some wires.

We did develop a problem that I finally fixed this past weekend. It had started stalling and stumbling on the transition back to idle. This was after the exhaust we had cobbled up came apart (even with the single Flowmaster still in place). It turns out that outside air getting to the downstream O2 sensor was the culprit. I got a different tailpipe back in and the problem went away.

We have recorded a high of 20mpg on the highway, with about 17mpg the norm.