Thank you Andy, Steve and Cass. Your words are respected on this board and I appreciate what you and everyone else has written here. I think that eventually I'll probably go with the 7/8" bore.
Dr, I think that you sparked something in my grey matter: The guy that sold me the axle and brakes DID say that this Master Cylinder was a "Corvette" unit. I thought that he was just bragging, like when people call an 18 spline transmission a "Hemi" 4 speed.
Jeff