Be very careful when you attempt to clean the left frame rail to find the VIN.. In many cases the numbers were very lightly stamped into the steel, to aggressive cleaning off of the rust scale, paints, etc., may result in the numbers being removed..
The correct number should start with a.... "star" 1800000 "star"... if the engine was originally a V8, can't remember the starting number for a 4 cylinder...
The VIN is also stamped into the frame on the left rear of the frame rail, usually on the axle hump..