Put the new ones in! My recent experience is that after a total rebuild of my 390 hp 427, I was having trouble keeping the hydraulic lifters set. Initially I thought it was just the break info new cam, liters etc. then I found it. The new valve springs were much stronger than the original springs. The motor was chewing up the tops of the push rods and I missed it by being cheap. Now I had small bits of push rods every. We have done our best but 9 of 16 push rods had visual damage and I have metal roaming around inside my motor. The price of new push rods looks pretty cheap compared to what I will spend to yank that motor and probably rebuild it.