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Hmm, maybe we can steal from F4U, regarding the cowling
Specifications:
Cruise speed-315 mph
max cruise (combat cruise)-330 mph
max speed-350 mph
range-2000 miles with 10,000 lbs of bombs
combat ceiling-30,000 ft.
Max gross weight-reccomended 90,000 lbs
While I would not specify engine type, R-2800 with a P-47 type turbo would seem the obvious choice. Possibly R-2600 with similar turbo.
Armament-need to ponder
Pressurization-none required
Teach bomber pilots to get their head out of low speed, low wing loading flying and become modern pilots.
i think this specifications are too hard for get in production in january '43
Why? The B-26 went from contract go-ahead to first delivery in two years, January, 1939 to February, 1941. Just add a year or two for a bigger and better plane and no great technology challenge over the B-26, I just don't see the problem.