Whats the deal with the KB 243's, good or not?

Not sure what you mean.... I'd assume that their numbers account for both bore size and ring position.

I was just noting that this is not an unusual ring position anymore; I am looking at a Chevy Lumina piston and a Ford HSC engine piston, where the higher top ring position is the same as on these KB's. So IMHO nothing to be concerned about.
Thanks, appreciate your time.