I am a newbie 1984 C-20 owner. It has a swapped 350 cid engine with a 4 speed manual transmission. Icannot find any VIN numbers on it. (the engine) As much as I have been told it is a 1985 engine. Is there any other way without stripping the motor down to tell the year. 80-85 2 piece 86 up one piece and how critical is the difference
