Piston gap

Hi, my dad and I are rebuilding a /6 for a 64 Valiant convertible. It's back from the machine shop, .030 bore, and we are putting it back together. Only problem is a gap between the top of the piston and the block deck - probably about 1/16th of an inch. Any ideas? Did the machine shop get the wrong length pistons? Just curious if anyone has encountered this before. Thanks for the help guys