They do!!! And so do a few other folks. But the CASE is built specially to fit an AMC engine!!!
IHC used them behind their own engines, and maybe you are aware that some IHCs (Scouts and light trucks) came with AMC engines. This lead to confusion, because IHC renamed the CID of one engine (I forget which way that went, 400/401) and guys were forever confusing AMC / IHC built engines for buying parts.