Rocker / Pushrod issue! please help!

[NewRevNorton]

I rebuilt my 283 roughly two weeks ago and added a Howards cam to it during the build. I will have to find the exact part number but I believe the lift was 449 and the duration was 290. I looked it up at the speed shop and was told it would be fine with the stock valve setup on my double hump heads. Shortly after the rebuild I found a broken pushrod. I replaced it and did not notice any issues. I had an exhaust leak so ticking was expected. I had another weekend off so I set out to fix the exhaust leak. Fixed that and found the ticking noise to be a rocker arm that was sideways off of the valve seat and the pushrod bent again. So I replaced the pushrod again. The truck ran nice and quiet for about 15 seconds at idle and the began ticking again. SAME ISSUE! SAME VALVE! So I checked the rocker arm and it was pretty worn where it contacts the valve. So this time I replaced the rocker arm, nut, pivot ball, and pushrod. Put it all back together, got it running for a short idle, and yet again... Rocker arm sitting off to the side of the valve and pushrod bent. I pulled the heads and noticed a nice gash in the rocker stud cutting over half way through it. I have the heads at the machine shop now getting a new rocker stud and valve to be safe. Any ideas or experience with this guys? It is always on the same valve, the pushrod guide has no visible wear or damage, and the valve seat seems nice and flat. I hate to waste my time getting a new stud if the issue will continue.
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