Book says .0015" feeler gauge. You may be able to get "good enough" by knurling the pistons...
Option #2 is find a set of .080 over pistons. Maybe Kanter or Egge?? or $$$$ on a custom forged set from Jahns, Arias, Ross, etc..
Option #3 puch the holes out bigger and sleeve them back down to a smaller size piston.
Option #4 get another block.
