Jon I'm wearing my armor so it's safe to throw rocks at me. I get where Tom is coming from.

Tom:
"I agree with your opinion concerning W1 vs. YF. I'd make this change if the W1s were more readily available."
Jon:
"As well as the carbs being common, so are parts; ever single component of the 483s/574s (with the exception of the choke cable bracket) is readily available."

I was curious so I started looking specifically for 483s/574s to see what I could find as far as good used carburetors. Disappointing. None.
It looks like the rebuild/resell hounds are hoovering them up.
Added to the dilemma, I can only think of one rebuild service I trust and he is a Stovebolt member.

Search results (for examples only):

ebay USCARBURETORS, $399.99 w/ $17.50 Standard Shipping
https://www.ebay.com/itm/403626436106
The base has been machined.

ebay CARBS6V4O, $1,999.99 free ship
https://www.ebay.com/itm/183558809560
No pictures

Classic Parts rebuild service , $279.95 + $125 core + shipping
https://www.classicparts.com/1949-Carburetor-Rebuilt-Carter-W1-216/productinfo/81-017

Chevs of the 40s rebuild service, $340.50 ($150.00 included in the price) + shipping
https://www.chevsofthe40s.com/detail/10646/Chevrolet_Carburetor_Carter_W1.html

I did not try posting for W-1 483s/574s carburetors in the Swap Meet mainly because I'm not actually buying.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."