There are DOHC heads for the 2.3 but its a European only thing and everything is different save the block. The same for the 2.0 as well as the 1600 Kent engines, just find yourself a Ford Cortina GT, but these engines are not as powerfull as todays 2.3 Turbo by a long shot. And parts are outrageously expensive. Get yourself a turbo 2.3 and contact Tiny Avenger Motorsports for their cam and 2.5 Ranger crank, they are claiming 300hp!!macs