A case in point is this adjustable metering block derived from the stock metering block for Holley's PN 7448-350 two-barrel (2-bbl) carburetor. This unit was originally designed as a 350-cfm Ford ...
We're willing to bet four tires and fuel for your IMCA style Modified that if you look in any rulebook in the country you'll find at least one reference to Holley's legendary 4412 two barrel ...