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Shouldn't you hit 14-16psi without the need of a 10lb lower? I figure you should hit that with a 2.8 upper and a 4lb lower with ease...
I built it 2001 5.4 bare block,stock crank, gt40 pistons and rods 8.4cr,stock mustang heads and cams, 04 harley truck m112 blower,10lb lower pulley,ford racing gt500,oil pump and head gaskets, fordracing 90mm cold air intake, eletric cooling fan. will be running atound 14 to 16lbs boost. hoping for around 400 to 450RWHP.
Stock is 6psi. with 9.0CR upper pulley only may get 10psi.