Okay firstly snce Fairlanes deal only with Auto's what ever your mate buys, tell him to get the Series with the 4 speed. I believe it was introduced whent the EA series II falcons rolled out. If you get a very first NA it will have the 3 speed box and it didn't suite the engine like it did in the XF.
I believe the NA had the 3.9 MPI making 139kw and 339Nm. The NC had the 4.0L making 148kw and 348Nm which was the same engine in the EB2.
Definitly the NC would be the go for your mate, as the engine trans and ride have all been enhanced. But at the end of the day it's all up to the condition of the car.
I hope this info will shed somelight.
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