Geometry isn't just about contact patch. It's also about the
relationship of the rocker to the amount of lift the valve will see. The stock rocker location is almost always wrong, especially with aftermarket cams. The shafts always need to move up toward the intake side of the head. How much depends on the rocker and the cam.
BH's may gain clearance, but would be an expensive bandaid fix vs rocker arm shims which put the shafts in the proper location for the cam. The proper location would negate the need to grind rockers for clearance AND ensure better valvetrain control. Win-win.
