Recommend that you start the tube from the side directly under the carburetor base (driver's side), tapping the tube toward the passenger side of the intake.
Probably, this is the only way that you can do it, because as John said, one end of the tube is bigger than the other!

Somebody is offering stainless steel replacement heat tubes... I THINK I saw them in a CASCO catalog. IF so, probably the other T-Bird parts suppliers are offering them, too.
Hope this helps.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York