Maybe this will help for the numbers.

Tecumseh carburetors will have a manufacturing number stamped on the mounting flange or the body followed by a date code. The mfg. no. on recent models is four digits and is followed by three characters for year, month and day of manufacture; older carbs may only have 2 or 3 digits. These number can be cross to service carburetor part number.
[Linked Image from i1329.photobucket.com]

Last edited by AVB; 06/04/15 10:02 AM.