I was talking to my engine builder at the machine shop regarding the 3791362 block. I found two 327 L30 blocks last month and he was saying they are rarer than hens teeth. The blocks were purchased for $200 each and one was found on Craigslist and the other at an auto repair shop. Obviously, the L30's were more common than the L79's or was that just plain luck? I am not boasting just looking for input! The codes are ZA and ZK (4 speed 275hp and automatic 275hp). The blocks were also date coded August 8, 1966. We purchased two 1967 Coupes and are currently restoring the cars with the L30 engines.