Sand Rail Air Filter Help Me Identify My Old VW Style Air Cooled Engine?

Help me identify my old VW style air cooled engine? - sand rail air filter

I try the engine in the old sand rail buggy I bought Zenith has dual carbs and when I bought an exhaust pipe to the exhaust holes are newly identified in a corner while the engine can lift screw on the right side and lower I find a number that is the case in the lead just before the screws on the tranny # 385 as someone suggested halves of a Porsche 356, but the stamped date is only a theory