The first thing to do is to determine what carburetor is on your 1949.

It came with a Carter type W-1 identification tag number 684s.

This link will help you to determine what you have: Carter W-1 identification

IF you have the 684s, then you have another question to answer. Is this going to be numbers-matching for show or a driver.

If numbers-matching, check your wallet before sending out the carburetor, and then "bite the bullet" as it is said; cost will be about the same as restoring a Corvette dual (2 4-barrel) set-up. The reason is that many parts, including the accelerator pump, in the 684s are simply unique, and literally must be fabricated by hand.

If a driver, consideration for a replacement Carter YF is a least something to think about. A new old stock YF or a fully reconditioned YF is going to be significantly less than having the 684s rebuilt.

Another consideration might be for a 1948 carburetor, the Carter type W-1 574s. You will lose the "faster idle" when pulling the choke, nothing else.

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