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They should be tight Bill if the rebore was done to the correct tight tolerances. But, they should move. Did you put any assembly lube (Graphogen or similar) or oil down the bores?
Another thought Bill, did whom ever do the rebore physically have the new pistons when the work was done?
Check the ring gaps, Do the pistons move in the bores without the rings?Sent from my SM-A750FN using Tapatalk
Measure the ring end gap Bill whilst the piston/ rings are in the bores. This will tell you quite a bit.
I assume the new pistons were numbered from when the rings were gapped to each cylinder when it was bored out or have you done that part?