Looks like I got lucky when I bought mine. They were selling the same on ebay but I don't see any now.
Mine has been working well but I run non-Ethanol. I installed it case I had to run Ethanol.
I guess I have to revise my recommendation to not include the Carter YF. What a pity.

A good Zenith (not Daytona) model would be a 11275. 30mm main venturi with 196 CFM (spec posted here on Stovebolt).

"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."