John,
You replied to my post in April and I am just now getting back to the subject.  I have the 60 torn down and have taken some measurements.  The pistons appear stock measuring 3.310.  Cylinders measure 3.316 at the top down to 3.313 at the bottom.  The upper comp rings have .008 to .010 side gap and all rings have large end gap in excess of .070.  Valves and seats look good but the exhaust valves have a lot of slop in the guides.  Exh valve stems measure from .365 to .3685 when they should be about .370.  Intake stems measure .370 to .3715.  I don't have a machine shop located yet and would like to have some resources for parts before I approach a shop.  I have read your article on this topic in the HPOCA magazine, but since I haven't rebuilt an engine with non-stock parts, I am still a little lost.  Any additional insights you can provide will be much appreciated.  Also, If you can recommend any machine shops in western Iowa that would be helpful as well.  I am in Onawa which is about 35 miles south of Sioux City.  Thanks,  Ken Tanner