Its suppose to be a 69 mustang mach1 428 scj ram air. The Vin number checks out 9t02r132263. I has the shaker hood with the ram air controlls. But i know about as much on ford motors then the man in the moon. I want to know how to check to see if indeed it is the original engine. The guy I bought it from bought it in 69 (showed title) I said it is the original engine but how can you tell for sure?