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Where does this carburetor hose go?

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Here is another question coming from the french section.
Any idea where this hose goes? It's coming from the firewall side of the carburetor on a 66 Mustang with a 289.

There are two copper tubes attached to the exhaust manifold that provide heat to the carburetor.  One stays copper all the way to the choke.  The other is copper until the last foot, then it becomes rubber. They are both covered in a white fiberglas material to retain heat.  This may be an unattached tube. It appears the one in question is the one that attaches to the underside of the top of the carburetor.  That choke arrangement he has does not look right as the tube that is attached to the exhaust manifold is also attached to the choke.  He may have some aftermarket headers and the original arrangement is FUBAR.  I am trying to attach a couple of pertinent pictures. If he wants it original, he has to get rid of that crap and make it right. 
I would like to see some decent pictures of exactly what he has because these pics are not descriptive enough of what is actually on his engine.  Tell him to take ten or twelve in-focus pictures of his engine bay and up-close pics of the tubes in question so we can give more pertinent advice. 
Jim will be along shortly to correct me.  That's OK......I have a 65, and there are some small differences in the 66's. 

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In Canada you need those two tubes only to keep the choke closed until the engine heats up enough to open the choke and lower the fast idle. My 'K' car has a manual choke but my other two have the tubes. It's a cold weather necessity - even in California when the temp gets to 40 F overnight (today at 6:30am it was 49 - high of 73F). The tubes are made from steel, not copper, as copper would melt from the exhaust heat. I would recomend that you get a National Parts Depot catalog - - and use it as a reference tool to identify parts and application. NPD has new replacement choke heater fitting and screen kit that replaces the old one on the underside of the RH manifold. I got two in my last order and got to figure out away to remove the old ones - easily.

Copper tubes won't melt from the air heat from the exhaust hot air.  Where did you come up with that ridiculous theory Jim?  ;D  Bottom line, is that he has the wrong choke system for a 1966 289 with a Motorcraft 2100 carburetor.  And, no those two tubes are not only used in the cold country.  My 65 289 was built in the San Jose, California plant.  Yes, the DSO was Denver, but it could have been sent to a warmer climate from San Jose, and mine was sent to an even warmer climate from Denver to west Texas. 
I just got through working with my front brakes, and had to deal with the copper/brass tubes that came with the original brake system.  I had to use a few sections of the originals because the steel lines didn't work.  Yes, the originals were copper/brass.  Ford also used copper/brass tubing on their carburetor tubing back then.   

  I got an original almost un-restored 65 in my garage, a GT Fastback. The tubes are steel. They are original. Yes, all cars had the automatic choke setup but in Southern California and in Florida too, most of the chokes were either disabled or set so they were hardly ever set. It was start the car and go. Exhaust manifold temperatures get to be somewhere between 700 and 1000 degrees F, hot enough to burn off any covering and hot enough to bond copper to cast iron, ergo, a steel tube. On early 64 V8 Mustangs with a 2 barrel carb, the rubber transition tube was connected to the air cleaner instead of the carburetor via a small 1/4 inch dia tube thru the base on both the old small top air cleaner and on the same basic large style used thru 1968 on 289 engines.


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