Hi all. I have a stock 57 Ford 312 engine bore .060 over when it was rebuilt and have been running a Holley list 1849 with mixed results.
I believe this is a 550 cfm carb. I experience idle issues, poor low end performance which leads me to believe that I might have
too much carb. Before I rebuild it, I am considering a brand new Holley 4160/ 0-8007 which is 390 cfm. Research shows that
list 1273 Holley came stock with the engine and was rated at 410 cfm. Engine is 322 cubic inches bored out and is stock in 
every other way (auto trans). The Holley carb selector points to the 390 carb to be the one to use. Any help that you can give
me to make a decision would be most helpful. I don't want to choose a carb that is too small either.

Scott

Redding, California