Holley LIST # 1625 Used Secondary/Rear Metering Block. Stamped 2120. The idle mixture screws are in the rear on this block because they would be inaccessible in the front on the 1625 carburetor. Removed from a Holley 4150-G and used on a 1958 Ford truck with a 332 V-8. Will need new gaskets, jets and a power valve. You will receive one metering block as pictured with your purchase. Returns are accepted if item is misrepresented. Any questions please ask. Thank you!