Yes, others have said the same - bottom end or bent rod. I just got done verifying the timing belt idler pulleys and spring and everything is tight. No sounds from the water pump either. I need to drain the oil and maybe a flush to be certain, but the car drives great and has great power with zero issues beyond this ticking noise. I need to drain the oil and inspect for shavings; maybe a flush to be certain, but the car drives great with zero issues beyond this ticking noise, so will probably just keep it going until there is a reason not to.Dang that doesn't sound good. What came of it (since your post was from mid-march and it's May now)?
It does sound like bottom end to me, but seems weird that it would start just after doing plugs and wires. And as far as I can remember, it seems like a knock would be a little more irregular.