hx35 54/60(mm) is excellent for 400-475.Can run +500.
Last summer 24psi/394ps/480Nm (std cams/pulleys) 27psi it take 450 std cams/adjustable pulleys(ex1mm/in0,8mm @ tdc)
And that new model (54/55) hx35 super (waiting what it pull in cos next summer)