Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
I'd go with the Yak-3 its variants have been used well beyond WW2 while the kingcobra hadn't.
Not trueI'm 30% sure the Yak-3 had been used in Vietnam (if not I may have confused a North Korean bird for a NV one :S )
Yak 3 total of 74.8 gallons.
P-63 total of a 126 to 132 gallons.
In February 1944, the Soviet government sent a highly experienced test pilot, Andrey G. Kochetkov, and an aviation engineer, Fyodor P. Suprun, to the Bell factories to participate in the development of the first production variant, the P-63A. Initially ignored by Bell engineers, Kochetkov's expert testing of the machine's spin characteristics (which led to airframe buckling) eventually led to a significant Soviet role in the development. After flat spin recovery proved impossible, and upon Kochetkov's making a final recommendation that pilots should bail out upon entering such a spin, he received a commendation from the Irving Parachute Company. The Kingcobra's maximum aft CG was moved forward to facilitate recovery from spins
It was short legged with a range of about 400 miles, but it was far from "suicide." The Spitfire MkI carried 85 gallons imp (102 US).Yak 3 would be useless unless the fight takes place above your airfield. You might not even complete the dogfight before running out of fuel. How could someone introduce a 1944 fighter aircraft with such a small fuel tank?