A '76-79 T-18 in a CJ has its own bellhousing, 3228248.
No adapter used.
The bell is the AMC pattern; six or V8, no difference.
Earlier CJs and the 258 truck/wagon T-18s through 1979 use the plate adapter you may be thinking of.
The V8 trucks and wagons are their own thing, with a much thicker adapter.