Add 100 mph to top speed, 20,000 feet to service ceiling, and 4 more guns (20mm cannons) to the a20 and you have a P-61 "target". Also carries 2,000 more pounds of bombs, but sounds like a hunter to me.
(source for all data: USAF Museum)
A20-G SPECIFICATIONS
Span: 61 ft. 4 in.
Length: 48 ft. 0 in.
Height: 17 ft. 7 in.
Weight: 26,580 lbs. gross weight
Armament: 4 fixed, forward firing .50-cal. machine guns in the nose, two fixed .50-cal. machine guns in the lower forward fuselage, two .50-cal. machine guns in a dorsal turret, and one .50-cal. machine gun in a ventral position (don't forget superfly!!) plus provisions for 4,000 lbs of bombs (2,000 lbs. internal & 2,000 lbs. external)
Engines: Two Wright R-2600-23 "Cyclone" supercharged radials of 1,600 hp. ea.
PERFORMANCE
Maximum speed: 317 mph.
Cruising speed: 230 mph
Combat Range: 1025 miles
Maximum Range: 2100 miles
Service Ceiling: 25,000 ft.
_____________________________ _______________________
P-61 SPECIFICATIONS
Span: 66 ft.
Length: 49 ft. 7 in.
Height: 14 ft. 8 in.
Weight: 35,855 lbs. loaded
Armament: Four .50-cal. machine guns in upper turret and four 20mm cannons in belly; 6,400 lbs. of bombs
Engines: Two Pratt & Whitney R-2800s of 2,100 hp. ea.
Cost: $170,000
Serial number: 43-8353
Displayed as: 42-39368 (P-61B)
PERFORMANCE
Maximum speed: 425 mph
Cruising speed: 275 mph
Range: 1,200 miles
Service Ceiling: 46,200 ft.