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Things wear over time. Get a mechanic's stethoscope and see if you can narrow it down.
The factory rockers work very well. I built a 427 for a road racer in England and according to rules, could not use a roller rocker arm. I used a set of factory adjustables, with some billet end stands and spacers, along with a solid flat tappet camshaft, with .640" lift.
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