SuzieQ,
The Date code you posted - L 21 9 - translates to a block cast on December 21st, 1959, so a model year '60 engine. F 12 22 J translates to an engine made in the Flint, MI plant, assembled and stamped on December 22nd, 1959, and the J designates original service as a light truck "Thriftmaster 235." The head casting '848 is correct for that engine.
The flywheel, if original to that engine, would have a 168-tooth ring gear, which is not compatible with a 6V starter drive gear, as others have said.
Hope this all helps.
Doug
Last edited by drdoug; 12/31/2021 3:45 PM.
