CK4331: Made in USA. Ethanol compatible.
The carburetor number (7-XX) is a faint stamping on the top of the float bowl cover. Please check the number as there are several variations of this carburetor which take different kits.
Buick 40 Stromberg AA-1 1937
Buick 40 Marvel Schebler Replacement Stromberg AAV-16 1937-1938
Buick 40 Special, 50 Super Stromberg AAV-167 1948-1949