I recently bought a 1966 chevy 3/4 ton pickup with a 292 engine. I had to buy a fuel line (fuel pump to carb) and received the incorrect part. After receiving the wrong part I was told that the engine was actually from a 67-69 p/u. My Question is: where is the casting number on the 292 engine. I would like to cross check the number, also what are the differences between these engines?