Yes, the 82 series 3 N6 does have the AMBAC fuel system and the 670I engine(slower 220hp). The earlier had the Roosamaster fuel system and the 670HI (smoking screamer 220hp). My 82 N6 S3 got it's first underhaul at 3100 hrs, most of the 670HI screamers were lucky to hold together for more than 1500 hrs without bearings and bolts.