FWIW, the Allison engine Mustangs which saw combat were:
Mustang Mk I - 2 x 0.50 cal BMG in nose, 4 x 0.30 cal BMG & 2 x .50 cal BMG in wings (mounted with .50 caliber between the .30 calibers in each wing). No bombs or drop tanks. 620 built, most sent to RAF.
Mustang Mk IA/P-51 Mustang - improved engine, 4 x 20 mm Hispano Mk II cannons in wings. 93 built, mostly used by RAF.
A-36 Apache/Invader/Mustang - improved engine, strengthened wing, dive flaps, 6 x .50 cal BMG - 2 in nose, 4 in wings, hard points for 2 x 500 lb. bombs, plumbing for 2 x 75 (later 85 gallon) drop tanks. Used in combat in the MTO (Morocco, Italy), and CBI Theater (Burma, China). 500 built.
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