Your going to want to have your heads checked for any cracked. I didn't even bother with having mine checked I just bought some aftermarket heads and went with the larger valves while I was at it. I wouldn't go for the 2.20 valves on a 5.2 as they are just too much for a stock engine.
If you can swing it do a poor man's rebuild. Replace only the parts that NEED to be replaced. Is can be done for pretty cheap if your able to use all standard size bearings and stuff. That is how my engine rebuild started but I have gone past that now.