Problems with my 318

Just got the Barracuda back from my shop, almost all the valves in my 318 are sticking. I hope it's just the heads that are messed up. If the pistons hit the valves and got dinged I'm really going to be PO'd. I paid big bucks for this engine to make sure everything is just right and dinged pistons aren't "just right" no matter what anyone says about how it won't affect performance or reliability. I feel like I have a tainted engine now...