14psi spring will be good if your planning to run around 20psi boost. Turbosmart are very good gates and it probably is something u want to be of good quality. I have heard the cheap ones can leak. If you want to save money don't bother with the cams and head gasket for now. Just do the studs. Johnny dosepipe made 376rwkw the other day on a non neo rb25 ,stock hg, stock cams, stock manifolds. Neo should be capable of the same if not more.