You are not about to burst my bubble. There is no difference between a warrantee engine and a over the counter engine. It would be stamped just like his is to id the fact that it is a 72 engine with 72 internal parts. I would think it was sold as a complete engine. Those tags usually don't last long. My AAR had a tag stating that it was factory built short engine. I bought a 77 400 and a 440 short block but do not remember what was stamped on them. I will have to look the next time at the shop. A short block should not have all the complete stampings that a complete engine sold over the counter.