That is probably what it is a "Z"
Z = Regular Engine PASSENGER CAR
Next to CON 3 or 4 Does the date code say> F 5 5 or F 05 5
Engine Block ID Locations Date Code, Engine Serial Number, Casting number
What is interesting the engine has a auto choke carb, solenoid starter and a truck breather tube.
Passenger car breather tubes are S shaped to bend around passenger car side engine mount.
Solenoid starters where used on passenger cars, I'm not to sure when GM went with Auto choke carbs. maybe Powerglide equipped engine.
