Hi there, the 4118 Holley that you are describing is an over-the-counter replacement for the early Shelby GT 350s, aimed at the 65-66s. I'm pretty sure it's a 725 CFM carb. I'm not sure what the L stands for that you have mentioned? I have been running one of these carbs on my 350 Clone since 2004. It's a great running carb but more suited for a well modified 289 as it is just too much for a standard 289. I believe the carb is likely worth anywhere from $100-$200 depending on how bad someone wants it. I have two others as spares and lately I have been seeing these prices slowly rising for these carbs . Folks here will likely not praise this carb because it is not an original, not even original to a Shelby, but it's a good carburetor nonetheless .