My father use to have several mustangs back when I was in high school. We found a Mustang with a 289 hipo and had a guy swap my 289 4v in my Mustang GTA with the other car. My dad had this guy do the engine work on a few of our cars. (He knew a little about motors but apparently not enough) My car has been setting since 1995. I took my motor to my neighbor and friend, he calls me today and tells me to come over. I get there and he shows me my motor and a book with all the numbers (apparently the motor thats been in this car for the last eighteen years was not the our motor. This motor came from a 1968. Im lost, and cant figure out what the hell happened to the motor. It's been eighteen years since this guy did the motor and I made a few calls today and he is somewhere in West Virgina. The two cars that were apart of the swap was my 67 GTA and a 66 fastback. Not sure where this 68 motor came from. I think this guy kept my motor and gave me one of his. I was fifteen at the time. I don't know what I can or should do.