It isn't removable, but I can't be sure it is pressed in (though I think it probably is). However the emissions version of the LMT seems to have had an elbow that was probably screwed in:
[Linked Image]

This makes me suspect that there is enough meat around the pressed in fitting, for a tapped thread. Of course it may be that the screwed in elbow version had a smaller hole, but I think there's a good chance it didn't. People don't usually change major tooling unless they have to.

Worst case, you need another LMT, which is not especially rare. Best case, you'll manage to remove the current fitting, tap the carburetor body to suit an elbow, and put it together.