Originally Posted by Gilly

The head bolts are only replaced if they have exceeded the stretch limit, you need to measure them all and compare to what the max limit is. I've never had to replace one, but every one I have ever reused HAS been checked.

I recommend running a tap through each bolt hole in the block and running each bolt through a die, then soaking the bolt in oil for a short time before reassembly. After chasing the threads in the block you need to blow each hole out with compressed air. Remove the bolts from the oil and lay them on a paper towel to let the excess oil drip off. Then reinstall by hand and start the torquing procedure to the letter, never let an air tool touch a head bolt!

No idea on the head gasket, I was at a dealer so whatever the parts dept gave me, never had a problem like you are describing, not after doing the job.