Its funny...ten years ago when I pulled the 454 out of my 79 Camaro, the guy I sold it too said he was putting it into a boat. Ironically, it had that same block and heads. Wish I had the numbers off it. It would be a hell of a coincidence if it was the same mill.
The block was from a 75 Monte Carlo and the heads were from a 1970 Ambulance. The Monte had the peanut heads so I dropped the big rectangles from the ambulance on the motor. No way to tell if it is the same mill, but wouldn't that be something!