Looks to me like it says DALTON. I expect the company that made them with the ALLSTATE name, would make them with whatever name you paid for?
In saw a set of Allstate heads on a car over 60 years ago. The owner was in the process of grinding the name off. Apparently back then, the owner didn't want anyone to know he bought his "hi-compression" heads at Sears.
Wow, very interesting. They sure do look like the Allstate castings with "DALTON" cast into them, and then machined off flat. No idea where that name would have come from, or who was doing the castings for Allstate but that's pretty fascinating, has to be incredibly rare.