When they get done with the simple act of repalcing your head gasket (let me point out that they are still working on that job) you will have one of the most durable engines know to man.
ONE THAT NEVER BREAKS TIMING CHAINS!, unless worked on improperly. They undoubtably did something wrong and my guess is they didn't do the chain tentioner right. It is a ratcheting tentioner and it will protrude when unloaded and stay TOO long if not dealt with properly. Look here for more info:
http://www.continentalimports.com/ser_ic100345.html
There is a better description and this picture of the tentioner apart. It needs to be this way and then reassembled. If they didn't do that it explains the chain. I can think of no normal reason.