Lifter Failure

I'm one of very few shops that even have the equipment to resurface lifters. It was one of my better investments I'd say!
Should I just run my new Engle Solid flat tappet cam and 25 to 30 year old Competition Cams lifters. Or have them resurfaced?
I also have 2 new-old Hydraulic Flat Cams and 25 to 30 years or so old lifters.
Guess I am asking trust old stuff or not.