1971 aussie built xy fairmont 429 dart small block chi 248cc cnc heads 4800 stall, full roller c4, alloy tail shaft, 9+ nine inch center F100 diff housing currie 31 spline axles custom 3.5" exhaust dynoed 685hp 575ftlbs on pump gas. This spec engine was in a 3500lb falcon did the best time of 9.80 @ 146mph with a pro systems carb 950, ic&e ignition.