Found this interesting photo of a Curtiss Hawk 75 "Pratt & Whitney Special". Looks to me like a P-36/P-40 fuselage with a 2000hp Grumman F6F Hellcat style radial engine and nacelle.
Hey Jeff (Corsning),
Care to guesstimate a likely region of performance specifications? The original 870hp Hawk 75s could be up-engined to 1200-1650hp Allisons and Merlins with minimal structural changes (apart from the visually obvious lengthened rear fuselage), so confident that a 2000hp radial Pratt & Whitney could be made to fit without major structural redesign apart from the engine mounts. But what sort of performance improvements?
Obviously not worth the effort to divert engines from F4U and F6F production (or perhaps P-47 production) to continue with, but that could have been for many other reasons other than just performance.