66 Dart still surgeing.Electrical??

Well I,m sure I,ve found my surge!I had the intake and D.side head off last week,then left it for this week.I went and pulled the pass. head off this morning.Valve tops are mushrromed!Now this was a re-built motor,.030 over flat tops,crank .010 over and a crane hyd.energizer cam 480 lift.Is this cam to big for a 77 360 or did the PO crank the rocker arm down to tight?I,m stuck here what to do?Do I get the heads redone?Buy eddies?Or just go but a 360 magnum for $500?Any suggestion will help?Thanks guys!

P.S sorry about crappy pics.

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