A good guess but not the one.   here's a few more hints.
 
  1 - twin engine
  2 - single seat fighter
  3 - low or low/midwing
  4 - design work began in 1943
  5 - initial deliveries began too late for active service in WW2  6 - merlin powered  7 - armament was 4  20 mm cannons and 8 rockets or 2 -1000 lb  bombs  8 - 383 built 
          
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