Hello guys i was wondering which one of these is the better of the two??....as for valve springs, reatainers, valves, camshafts go????......i am wanting to build up my head and im a difficult choice between these two companys....i hear nothing but good things about these guys so please tell which to go with....oh yeah the motor is 1.8 GSR goin for N/A.....thank you and have a nice day!!!