Its too early to panic mate I would suggest getting the oil pressure checked when hot first , a decent place should charge no more than 1 hours labour , once you have that data you can work out your next step
As I said earlier its really hard to diagnose a fault like this online but bearing in mind the oil gallery gasket issue it could well be increased valve train noise due to reduced oil pressure at idle , but its just a thought
The 350HR guys might be able to give you an idea of what they paid as a ballpark