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When i got my C5 it had a little tick -- At first i thought it was Ls1 lifter tick -- but got a little worse over the couple weeks... started sounding like an exhaust leak a little bit...
turned out to be a loose spark plug -- causing an exhaust leak around the spark plug. Found it by chance when hood up and car running -- so loose it was jiggling the plug wire back and forth.... tightened her up and good to go!
Lets hope its not a lifter at that mileage would think not
Very tasteful mods, if the car is that nice for the $ go back unannounced start it up cold. If it feels right pick it up. Guy spent money in the right places on that one.
If the noise simmers down after 15-30seconds its probably the lifters dont sweat it;is there a reputable LSx expert nearby you can have listen to it?