Unpredicatable start
It was just their engine designation letter. A = 258 reg. B= 258 low compression c=258 2 bbl carb.E=232 reg F=232 low compression. H=304 v8 2bbl N=360 2bbl P=360 4 bbl Z=401 4bbl. This is from 1973 until 1980.
THis engine code is the 6th character in the VIN # for the Jeep vehicle.
Later,
Jackal