The pictured engine is a 1974 440 truck engine originally built at the Trenton Engine Plant, in Trenton Michigan, on February 3, 1974.
The engine has been modified some with an aluminum intake manifold. The water pump housing and timing cover have been off and painted, as well as the mounted accessory (power steering pump bracket?). The distributor hold-down has been painted blue. The valley pan end rail and bolts have been off and repainted, and the valley pan resealed or replaced. Plus the head and block surfaces have been dressed. Perhaps more.