Imagine a piece of exhaust pipe cut in half and placed around header with a tube to connect choke tube to. Held in place with hose clamps. For a neater look, the half with fitting could be welded to header tube. Of course I wouldn't do that with coated headers.
Edit: Of course you could convert to a manual or electric choke if you don't like the looks of this type.
66 Coupe 200ci I6 Stock
66 Bronco half cab 203ci I6, CI aluminum Head and intake, Holley 390cfm 4V, Clifford header, Isky cam, KB pistons 9.7:1 comp, DSII ignition