One way is to ask a local Subaru dealer who they use for their head work. Probably the guy you went to will do the job fine. I doubt any issues with the bottom end or heads. Most just use OEM valves as they aren't that expensive. Not sure what aftermarket options are available.
Did you not do the timing belt job when you did the HGs? Or did you use a Gates kit unknowing they are Chinese crap parts now?
Did you not do the timing belt job when you did the HGs? Or did you use a Gates kit unknowing they are Chinese crap parts now?