44 US gal (167 L; 37 imp gal) fuel tanks . Two cars were further modified with four-wheel drive . The AIR team built AMC's 390 cu in (6.4 L) V8 engines to blueprint tolerances, thus increasing horsepower to 410 hp (306 kW; 416 PS) at the flywheel . The cars were capable of 140 mph (230 km/h) runs along smooth straights at about