Tim - give me a call. 573-392-7378 (9-4 Mon-Tues central time).

The 684s is correct for a 1949; but since it is a one year, one make, it is expensive, and parts are ridiculous.

If you don't have to have the fast idle, the 1948 carburetor 574s is just as good, and less expensive.

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