I had a 1900 american tall block, cosworth fuel pump, stage 3 big valve head by chd, kent cvh 35cam, unlimited boost chip (which is pretty much what they all do) drilled airbox, stage 3 turbo with cossy compressor wheel by cr turbos, 14psi of boost, got it set up by msd and they reconed it was leaning off at about 190bhp, they dropped the boost down to 14psi and they advised it was pushing a strong 180bhp. Some metering heads will flow the fuel but I wouldnt advise it imo, get gotech mfi on it with the injector manifold from jam and you could hit that bhp figure with no hedaches

hope that helps matey