therm quad size

Wow a lot of different opinions on TQ carbs. Take the time if you buy a used carb and check for cracks in the phenolic. Unfamiliar people will miss a screw and crack them trying to pry them apart. If it doesn't fall apart with the screws out you missed one.
I thought the sizes for TQ were 780,880, & 980. I have all of them on my shelf, different years and options. 980 was from police interceptors and is streetable on a warm 440. (Works great with a Crower 'Hot Street Beast".)The 780 is what came on my 78 Diplomat.Don't be afraid to build your own TQ. Most kits have great instructions.
Take your time when you rebuild, inspect every part carefully, if it's suspect reject.
Most bog on my cars was air door adjustment (On older TQ's). Have fun, there's nothing like the howl of a TQ at wide open throttle to put the fear of Dodge into bowtie or blue oval types.