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Aluminum "Winfield" heads are all repops. His were cast iron. You could probably count all the different designers, casters and cloners of Model A flat and OH valve or cam heads on 20 or 30 hands.........
Since most wanted their product to look like an original they didn't mark them. Some are known to be bad or marginal but without knowing the maker it's hard to know what you have.
The pinnacle of the A flathead has to be a Brierley. It's 7:1 with a thick deck and taller height to increase cooling. It also has a very efficient combustion chamber.