 Updated production version with two 2 @,@ 500 hp ( 1 @,@ 864 kW ) R @-@ 2800 @-@ 48 radial engines and one J33 @-@ A @-@ 10 , taller tailfin , slightly longer fuselage and increased fuel capacity , 55 built , survivors redesignated A @-@ 2B in 1962 . 
