It is very easy to make a 'heat stove' to use when installing a hot air choke on a vehicle that did not have one originally.

(A) obtain a piece of sheet metal (.030 to .075 or so).
(B) cut into a rectangle 3 inch by 5 inch
(C) cut a half inch square from each corner
(D) fold up the sides and ends one half inch from the edges, forming a one half inch deep rectangular 'cup'
(E) drill a hole in the center for a vacuum fitting
(F) install a vacuum fitting in the hole, with the thread away from the 'cup'
(G) clamp the unit onto the exhaust manifold with the 'cup' facing the exhaust manifold. Muffler 'U-clamps' normally work well
(H) attach a quarter inch tube from the fitting to the heat input on the auto choke on the carburetor.

The air will be pulled into the 'cup' and warmed by the exhaust manifold, then pulled through the tube into the choke.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop