im running a sitech racing built 2.0zvh, newman cam ,stage 2 big valve head, forged rods and pistons. simon recommended fitting a 5th injector kit to get the right fuelling a lot of people say there crap but ive never had any issues with mine they just need set up properly ,might go to efi one day but right now im looking for a new shell as the arse is rotted out of mine fkn old fords,lol