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The 58% means that the total width of the exhaust port width plus the intake port width is 58% of the bore diameter?
No each port is figured separately and each can be up to 70% of the bore diameter. But there are also other limiting factors that have to be figured as well like; piston ring end placement, the distance from the finished port to the edge of the piston windows. Search and you will find acres of info on this subject in the archives. People like Brad Snelling, timberwolf, Jacob J, treeslinger etc. have posted miles of threads and pics of what to do and what not to do. Way better source of info than me. I'm just using their knowledge and trying to learn the ins and outs of porting/modding myself.
What Jred small cyl do you have on your 266XP? 625 or 630?