I had a near perfect 57 tach-drive distributor on my 55 Tbird. I had no idea when I inherited the car, and I don't think my dad (2nd owner) knew either. I didn't discover it until I went to replace the distributor cap with a new 55 distributor cap; the 55 cap is smaller. That's when I learned that the original 55 Teapot carburetor /w divorced choke was not compatible with the 57 distributor. The car seemed to run fine, no problem idling or cruising around town or on the highway, but as soon as I put my foot in it, it would miss, and the Fordomatic wouldn't automatically downshift. That's when I contacted Gil Baumgartner (CTCI Gil's Garage) and asked for his advice. His first question was, "What do you want to do with the car?", to which I replied, "Drive it." He then recommended that I keep the 57 distributor and replace the Teapot with a modern carburetor; I did. Rather than getting an adapter for the 55 intake manifold, I bought an ECZ-B intake manifold.

Not long afterwards, I discovered that the short block in my 55 was a 56 ECZ-A. At that point, I was no longer concerned about keeping the car original. 

BTW: A NOS ‘57 ‘F’ code dist. just popped up on eBay ($5K)
When I decided to replace the 57 Tbird distributor with a CRT, I decided to sell it. I thought I could get a handsome amount for it (based on the outrageous prices I had seen on eBay). However, I ended up selling it to a fellow member of the Sacramento Valley Classic Thunderbird Club who owns a 57. Although he said that he wanted it for a spare, he could have resold it for profit. I used the proceeds to buy the CRT distributor. If my car had been a 57 instead of a 55, I would not have parted with the 57 distributor.

21.00 for a simple nipple fitting. 

You must have one hell of a good job ...
Np Paul, I have never seen a BIRD or worked on one. Guess I never progressed that far.

The line that CASCO WILL FIT.;   It is made specifically for a 57 distributor and says so in their catalog, despite what the other poster said. .  I bought the same line and used it in the 57 distributor that I have in my 56 Bird.

Yours is with an ECZ-B intake and HOLLEY with vacuum port in the same position as the OEM?

That tube was formed for a 57 312 w a 1957/59 DUAL ADV DIS w/ a 1957 OEM H4150 and ECZ-B INTAKE and will also fit a 1955 292 H2140 with a DUAL ADVANCE DIST retrofit? Wonder how many times he will have to re-bend and modify?

They are fancy, one fits all.

The OP has not decided yet if he is going to later fuel induction.

The line that CASCO WILL FIT.;   It is made specifically for a 57 distributor and says so in their catalog, despite what the other poster said. .  I bought the same line and used it in the 57 distributor that I have in my 56 Bird.

Yours is with an ECZ-B intake and HOLLEY with vacuum port iN the same position as the OEM?

That tube was formed for a 57 312 w a 1957/59 DUAL ADV DIS w/ a 1957 OEM H4150 and ECZ-B INTAKE and will also fit a 1955 292 H2140 with a DUAL ADVANCE DIST retrofit? Wonder how many times he will have to re-bend and modify?

They are fancy, one fits all.

The OP has not decided yet if he is going to later fuel induction.