I bought a 455 engine a few years back and finally thought to check the numbers on it. I was told it came from a 1973 Rivera. The engine code is WF and the VIN stamped next to the oil pressure sending unit indicates it is a 1972. Of course the number only includes the make, year and plant and not the body. Is there a way to find what car it came from just based on the year and serial number? Buick Heritage maybe?