I put a custom kit together, which would run you $371.73 + $19.95 shipping. The pistons are available in standard and .020 over.

Kit would include:

4 REPC RY6314 PISTON AND RING ASSY
1 REPC 4B1136 ROD BEARING SET
1 REPC 3C9963 CAM BEARING SET
1 REPC 09-00010 FULL GASKET SET
1 EPGT TB091 Timing Belt
1 CLEV MS1430P Main Bearings Sets
1 FM 4-68304Y Piston Pin Bushing S
1 EPGT TB092 Timing Belt

owned a few .. current 86 rustbucket 2.5td . manual hubs