Visit Steve Wyndham website (www.stevewyndhamracing.com). He does camshafts and exhaust manifolds for Rocam 1.6 (Duratec 8V).
I reach 153hp in my Rocam 1.6 naturally aspirated with: SWR stage 2 camshaft + reworked header + 13,0:1 compression ration (100% ethanol)... Gear cut at 7500rpm. Excelent car for track days!!!