The BOSS Redistry shows a D0AE L as a correct 4 bolt Boss block
It's shown as a Boss block but I don't see the main caps. It's hard to make out the casting date. Is that 0D11 or 0G11?

From the FAQs, they didn't know when the first car was built. The earliest "date invoiced" on a build sheet of a Boss 351 is 11/5/70. (3 cars).