super six advise and questions
All of the carbs you have are (way) too much/too big. A 273 or 318 carb (Carter BBD or Bendix-Stromburg WW3) can be made to work well with some adaptation and adjustment. A BBD originally configured for Slant-6 usage is the easiest and generally best-running factory carb option. The hard part is finding one in good condition, which means avoiding "remanufactured" junk and "100% NEW NEW NEW NEW!!!!!!!1111!!!!!" knockoff garbage from China that's all over the internet. I have another one (last one) of
these on the shelf in Michigan; send me a PM if you're interested.
If you want to explore non-factory carb options, the Motorcraft 2100/2105 has been adapted with very good results; see
this thread and
this one.
If you have an automatic trans, you'll need a different kickdown linkage. Factory parts have grown scarce and expensive; See
this thread for kickdown options.
You'll need an air cleaner -- a factory-type unit is best; which one to get depends on which carb you'll be running.