Line up all the timing marks and make sure that it didn't jump. If the marks are good, then you might want to pull the valve cover and check the valve train. Give it a good lookover for anything that looks amiss. If the marks are off, when you pull the valve cover, you will definitely know that things are afu. Most likely you will see that the corresponding rollers are loose or out of position entirely. If that's the case, pull the head and look deeper.

From the noises and symptoms you're describing, it sounds like the motor may have jumped timing. Worse case, you bent some valves up, and probably cracked the corresponding valve guides in the process. If that's the case, pull the head and inspect the pistons. You can get by with some minor indentions on the tops of the pistons.

On previous DSM's, I've gone through a few heads, but have never had to replace bottom end components.

If it's a 2G and you need a head, give me a shout, I've got one available. If you need any help, let me know and I may be able to give you a hand.