Also the spacing between the torsion bars is wider on a B body than an A body, theres more room to increase bolt spacing and spread out the load. A body A904s and A833s were also a short tailshaft transmission. B bodies used a longer tailshaft trans so they werent exactly the same transmissions. Wasnt a Chevy Nova pull out the inline 6 and drop in a small block and use everything off the 6 including the transmission kinda thing. If nothing else Chrysler made everything different for each car line it seems lol.