BB Stamping Question

[COPO]

I have a 1967 4-bolt main #351 block that has a cast date of D-18-7. The stamping is T06227AZ. Any ideas of application? It is a standard bore, never decked engine. I couldn't find any applications in Colvin's book.

[Zedder]

Given this chart, I would think it's a marine engine...

http://www.nastyz28.com/gm-chevy-codes/chevy-engine-codes-suffix-11.php