With my limited flathead experience and only one picture, I can't tell other than I think they are 21 stud blocks with block mouthed water pumps, which I think puts them from '36 to early '38 ? Just a guess.
It's the only pic I have. I'm trying to figure out on the 2nd one what the pieces are that are mounted on either side. And what castings had pipe plugs on the jackets.
They ARE V8-60s. This pic shows the exhaust port studs in a vertical, rather than slanted configuration. You can also see the coolant hose exiting the side of block. DD