Being successful in the P-40 requires that you master the airplane's handling characteristics.
With some E, it's extremely dangerous. It'll keep up with or run down most of the plane set in a prolonged dive. Great flaps, adequate climb with WEP (P-40E).
Just avoid flying around with full flaps for very long as it lacks the power to maintain a good rate of turn. P-40s require solid E management... Practice that. Stall departure is vicious, so learn where the limits are and tread lightly when near them. Lousy acceleration, but good ailerons and a strong rudder.
I flew it a bit last tour.. Never lost a fight and only lost 1 P-40, and that one to a collision that was my fault.
The P-40E is a 1941 vintage fighter... It does very well considering that fact.
My regards,
Widewing