I have a 1993 Ford F250 XLT that has a 7.5 liter engine with less than 80K miles. I bought it new and it has always been garaged. I had no problems with the truck except that it was using oil since new, about a quart every 400-500 miles. Recently I had the engine rebuilt and it appears that my engine and other items were swapped including the radiator, the Fill-Oil Cap, the valve covers, wiring harness, sensors and control parts. After the engine was rebuilt it had several broken connectors, it was missing terribly and smelling like gasoline upon starting. I took it to a repair shop where the repair men replaced the fuel filter which was less than 2-years old and less than 2,000 miles, they also checked timing, engine pressure and valve train tightness, they found leaky injectors, a bad MAP and ECT sensor. The leaky injectors were fixed and the MAP and ECT had to be replaced to clear the CHECK ENGINE LIGHT, but the engine continued missing. The present radiator is stamped FORD with the following numbers 162A-X-13TK250. A Ford factory service manual for 1993 Ford trucks states that the VIN is located on the instrument panel close to the passenger side of the vehicle and on the Safety compliance certification label that is located on the driver's side door post. The manual also states that there is an Engine Code Label on the rocker arm cover (I could not find that label). After having the engine repaired I have spent an additional $500 and still misses when cold. I fear that the truck might not pass the next smog test. How can I prove that the engine was swapped?