See the problem for me is probebly not getting the parts, i can probably find a store to get all the stuff (springs, light weigh valves, retainers, regrinded camshaft). the problem for me is -actually more of a dilemma, if I should completely rebuild my engine and keep building on it, or get myself a new (more like slightly used) h22 engine and go from there.
But yeah, forget my previos comment about not changing the retainers and springs.
The only thing about buying a new camshaft would be to make sure that it will increase at low and medium rpms, so the car has more torque at lower rpm's not at high rpms, cause that will seriously increase the valve overlap, turning gas milage into nothing, and the car won't pass emissions test.
So to make it more simplified, make sure you know the degrees of lobes on the regrinded camshaft.