I just did a quick 2D cad drawing using some of the basic dimensions and it looks like the lifter bores would have to also be "rotated" toward the centerline of the engine around the cam axis, not just tilted so even reboring the lifter bores to correct the angle would take out all of the material on the inboard side of the bores. There'd be no meat to put a bushing into.
That is assuming the lifter bores are aligned with the cam centerline so I could be wrong.