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sopwith pup(Bristol) Bulldog?
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Italy. ?? I think they produced some good bi-planes during the late 1930s.
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I would think the radial of the P-36 was far less expensive than the liquid cooled Allison. Just a guess.
Disclaimer.
if your heart is set on a WWII era stall fighter I recommend these aircraft.
USA. P-36.
Japan. IJA Ki-43. IJN A6M was good too.
VVS. I-16.
RAF. Gloster Gladiator.
Italy. ?? I think they produced some good bi-planes during the late 1930s.
Germany. No WWII era stall fighters. The jumped straight to the Me-109 which was designed to Boom Zoom.
I can't remember where I read it anymore, but I remember reading that the Northrop P-66 was even more maneuverable than the P-36.