The Consolidated XP-33 was a proposed adaptation of the P-30 two-seat
fighter to take an 800hp Pratt & Whitney R-1830-1 radial engine in
place of the 700 hp turbosupercharged Curtiss V-1570-61 liquid-cooled
V12-engine. It was never built.
Sources:
The American Fighter, Enzo Angellucci and Peter Bowers, Orion Books,
1987.