Re: which is it?
The 258ci I-6 was an option in almost ALL AMC Jeeps and cars. I added a 2bbl intake (to a '76 Cherokee I owned years ago) from a 1985 AMC Eagle sedan. Only the emissions equipment was different. The T-18 was also used by Ford, in the F-100 and F-150s. The Dana 20 was used in ALL the '83 and older Jeeps at one time or another. The sheetmetal will interchange from '74 to '83, and some '73s will also.
Jeep is the make, Cherokee is the model, and Wagoneer is the trim option package. A 1983 Cherokee could not get power leather seats, tinted windows, or a factory tow hitch AT NO COST. A/C, cruise, tilt steering, premium sound (such as it was), power windows, power seats, V-8, auto, and Selec-Trac (New Process 229) were STANDARD on the Wagoneer. The Cherokee buyer would have paid about $3,800.00US for these features!