Aaron, for a quick and dirty G-6/AS, use the Hasegawa or Trumpeter G-10 with the G-6 propeller blades, small wing bumps and G-6 wheels (660x160) this will get you pretty darn close. You'll also want to use the smaller oil cooler too I believe.
Steve is probably aware of couple smaller details that I'm missing but that's the biggies IIRC.