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Short answer...yes you can add a converter and have it work. You'll be using a two way converter like in the 70's since you don't have computer controlled fuel or oxygen sensors.
However, you shouldn't be getting fumes in your car anyway. Make sure your exhaust is tight and keep the engine...
There's no real reason to think that adding catalytic converters means the power will go away, modern cars have them too. However, even those require some electronics. The old two way converters won't do much for NOx emissions, the modern three way have been in use for nearly forty years now...
I used the stud kit that Rick Ehrenberg sells and they fit just fine. https://www.ebay.ca/itm/for-Mopar-440-383-Exhaust-Manifold-Hdw-Hi-Po-Manifolds-68-74-B-E-Body-Dodge-Ply/323968952347?hash=item4b6e0de81b:g:Ny8AAOSwlHJbL6nz
Oh, okay. I had understood that it was illegal to give them out without a request, but it was okay if someone asked for them. I have no problem with paper straws. Actually, I just use stainless steel straws here at home.
Back to exhaust now. :)
Electric steering is more common on new cars. Cars that run with the engine off such as hybrids need electric steering. There is a pretty good DIY article here in the forums...