There was only ONE 2bbl for the 1972 400 B V-8. A Holley 2210 2bbl (but a few different models of that for the particular vehicle's equipment and emissions specs). Unless the replacement was with a prior model year Carter BBD 1.56" 2bbl, either one or the other. The carburetor "tag" or "stamp number" will identify what's on there currently.
It's nice to own and drive an older car, BUT in modern times, the owner/operator needs to have a basic knowledge of what the car is and the equipment/components it might have on it.
A repair shop might well be certified/recommended by a national, respected organization, BUT also consider that an older car is not usually what they see in the shop for repairs. Certainly, the certification/recommendation CAN give them a greater amount of credibility, BUT unless those that work there KNOW and UNDERSTAND something that's 40+ years old, there might be "some mis-fires", possibly. NOT that they couldn't learn or "figure it out", but finding a shop that's credible, reasonably-priced, AND understands vintage Chrysler products (as each of the Big Three, back then, each had their own "quirks" about them). In other words, the systems might be similar and operate similarly, BUT how they were repaired were quite different, in many cases. Same would apply with a Ford or GM, but more people have probably seen more older GMs and Fords, compared to older Chrysler products. BTAIM.
Being "mechanically challenged" is something that many of us have experienced at one time or another. Happens to everybody, sooner or later. BUT many of us got past that, as sometimes we had to, because the quality of the repairs that were done on our cars was not what it should have been. Hence, we learned to do a good bit of our own stuff. AND find the better places to get things we couldn't do, done. Book learning can go only so far, which is where good mentors come into play.
The OTHER thing is to know enough about your vehicle to be able to ask the right questions, convey the correct information of what appears to be wrong with the vehicle, in the hopeful end result that you get quality repairs at reasonable prices. Plus possibly build a friendly customer/repair shop relationship in the process.
Key thing is that you don't feel you're "at the mercy" of some repair shop and what they can do, in order to drive and enjoy ANY older vehicle. Knowing what made Chrysler products different from similar Ford and GM products can go a long way, too, to me. Just as learning the quirks of getting it to operate correctly can be important, too. But when "right", they do so many things very well.
Do keep us advised of what the shop might determine,
Thanks,
CBODY67
