I chased this problem for 3-4 months before I changed those 2 things and I never had anymore problems. People told me it could be the coil, the fuel pump, the TPS, the spark plug and coil wires, anything, and I wasted alot of money on replacing parts that were not in need of being replaced.
As for your ticking problem...when you installed the heads-did you adjust them properly? If they are pedestal mount, then did you check to see if you needed any shims? I guess from what you explain it sounds like the valve train is out of adjustment.
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