Trippleplate in Spokane,WA is what my dad has used for 3 different projects (2 58 Chevys & a 36 Buick 4 door hotrod).
Their work as of 7 years ago was flawless. If it wasn't, they fixed it for free. They will chrome, nickel... whatever you want (36 Buick only has nickel finish on the grill. Still looks great).