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crackedback said

If it was my car, I'd put a good valve spring on it and get the jetting spread under control. I'd put a set of beehives on it, set to ~.060-.080 of coil bind and see what it does.

The rockers were likely giving you problems because they were getting the snot kicked out of them because your valve springs were weak.

The cam in the engine is OK and you don't need a tear down to do the valve springs.

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I agree, those stock Edelbrock springs that say they are good for .570 lift are talking about flat tappet spring pressures, and not made to control a roller lifter that weighs more than a flat tappet...not to mention that roller ramps are more aggressive than flat tappet ramps (typically)....and I won't even get into the fact that you can just say a spring is good for X-amount of lift without knowing anything about the ramp....but I digress. Stick some good springs on and let it eat! :D