Hi Fred and all,NAPA has a replacement element for the '57 T-Bird air filter, their p/n is 2063. It is 2.2" high, better than some sold by the T-Bird parts houses which are only 2" high.
I haven't tried buying a K&N filter for my car, but their p/n is supposed to be E-1580.
Daniel, I'm using a Carter AFB #9635 carb which is very similar to the edelbrock #1406. I bought the edelbrock banjo fitting for the fuel inlet which is necessry to clear the T-Bird air cleaner. The edelbrock p/n is 8089, about $19. Then you use a short piece of 3/8" rubber hose and convert that to hook up to the 5/16" metal fuel line. As far as converting the T-Bird air cleaner to fit the edelbrock or Carter carb, a slight amount of trimming is necessary to get the base to sit on the top of the carb. Also I had to bend a tab or two at the bottom of the base. It's pretty easy to see when you try to install the air cleaner base on the carb. About a 5 or 10 minute job with tin snips and pliers. Totally out of sight once the air cleaner is on the carb.
At first I ran the 5/16" fuel line in front of the carb by the heater control valve, then back to the carb's fuel inlet. But it suffered vapor lock, too much heat as the fuel line was close to the water passage in the front of the manifold. So now I've got the fuel line going back on the driver's side, then across the back of the carb to the banjo fitting and 3/8" hose. Works fine, no more vapor lock.
I think the '57 T-Bird air cleaner is a good choice for other Fords, (appearance wise) and it seems to flow OK. The Carter carb is excellent, I prefer it over the Holleys I've used.
Don't know how to post photos, maybe someone can give me some tips and I'll add some of my carb/fuel line pictures.
Sorry for the long message- good luck!
Nick Brann, K.C., MO