I'm looking at rebuilding my 2L engine down the line and was wondering about the quality of new parts like piston/liner sets, valves, valve springs, etc. Are they as good, worse, or better than NOS Alfa (assuming you could run across the NOS). I imagine that new parts vary in quality based on the maker, etc. Any thoughts on what you'd get NOS if you could and what you'd prefer to be new production? Thanks!