I believe warbirds should be flown scale. Not to take-off in 15 feet ,straight up doing fast tight rolls like an overpowered 3D plane. I don't know of any FW190 pylon racers ever built.
But, it's your plane and you can do what you like with it A 20cc should fly it scale with some reserve, a 30cc would be a lot of engine for it. Not sure how well their ARF's are or how the wings are built so I can't tell you if it would start flying apart if you are going to fly it fast. If you stick-built it then you could make provisions for that.