The ticking could be the carbon canister. That's the little black box by the power steering fluid reservoir. If you unplug the multiplug from the carbon canister and the ticking stops, there's the source!
Normally a blown gasket along the exhaust system will make a bassy, pulsing sound, like a V1 rocket I guess. It's very distinctive and not what I'd describe as a tick. However, that does look suspect and the decrease in noise as you drive could be caused by the manifold expanding with the heat and closing the gap a little.
The best way of telling is to turn the engine on and place your hand by the suspected leak. You'll be able to feel the blow.