Holley Blackheart transmission Cross member

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You are correct MoparMatt2000,

Here's a side by side comparison. Top pic is B Body. Although the center section is similar. the end section is different probably because floor pan between A and B body is different. Much longer spacing between bolt holes.

Holly does not show an A-Body Blackheart crossmember , probably because there is no demand for it. If it was an item there was a market for, I'm pretty sure they would make it.
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.