The most sensible option
Sound like a broken record i know, but by the time you "customise" your China solution, you might as well piece together something yourself.
Earls billet block and head adaptor, race fittings and any core your heart desires and some time, and you have a solution that completely fulfils your needs and uses world industry standard fittings.
Hearing others that are using China setups and are "ok" so far, is like that simpsons ep where Homer wears a bear repelling hat... that works cus "hell, i dont see any bears, do you?"
Custom or brand name Jap setup is really the only thing you should be considering if your serious about your pride and joy.
My cents.