Update.. Totally Dissapointed !!!!!

Sounds more to me like the owner is doing everything he can to make it right. i'd wager the valve size was a mistake on their part, because my shop will just put in bigger ones if the price is that close or the customer specs otherwise. I would not accept the engine back unless it is accompanied by an assembly report. I dont have a scanner, but the one I use is 4 pages long. It includes every part number for every part, measured clearances for every spec (heads and block), measured data and the resulting compression ratio, where the cam is set at degree wise, ring gaps, clearances, and any notes about stuff I may need to jot down (like lifters not liking to turn unless attention is paid to them, and even checking lifter rotation). I keep the original, customer gets a copy. Then should something happen, you can go back and see what part you need, and it verifies the assembler did actually measure things like piston to valve clearance, assembled deck height, and cam installation. Then you are assured as much as possible that the shop did the job you're paying for, and you have evidence should something go wrong, and you find a different part in their, or the rings butt and you see the spec they set them to was too tight. Get everything in writing, and a warranty (if any) should be stated, and dated for the latest date. Not the original date of purchase.