'55 Chevy would be 324 or 265. The 324 was an Oldsmobile engine.
Chevrolet never used an Oldsmobile engine, the only V8 available in the 1955 Chevrolet was the 265. GMC did used Oldsmobile and Pontiac engines through the years.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD