so just get the head back while they do the block, or have them send you the motor back with the head not installed...
then you can look over the pistons, make sure they are what they claim to have installed
get a valve spring compressor, new valves seals, lapping compound, valve lapper, dremel and P&P kit, do the lapping and P&P, then reinstall the valves with your upgraded springs and retainers, then put the head on with the new headgasket and arp head bolts
then you can look over the pistons, make sure they are what they claim to have installed
get a valve spring compressor, new valves seals, lapping compound, valve lapper, dremel and P&P kit, do the lapping and P&P, then reinstall the valves with your upgraded springs and retainers, then put the head on with the new headgasket and arp head bolts