Some pics of the Top-End Rebuild:

 

Home-Made Piston-Ring Compressor:

 

 

New KB Flat-Top piston.

 

Bored by RIMCO (Now FAT) in California, High-Heat painted, honed and ready to install...

 

 

Each was marked as A-B-C-D to match them with the Lapped (grinding compound mated) cylinder head position:

 

 

Old vs New Pistons.  Notice the thinner and lighter wrist-pin and the lighter inner knife-edge of the KB pistons: