Valvetrain Geometry

That was sorta my question. 48 degrees seems to be the "perfect" angle. Only 3 degrees from 45. 11 degrees from 59. What I was getting at was, I'd rather have 45 than 59. lol Can the stock blocks lifter angle be "corrected" to 48?
Wonder how much it could be corrected with lifter bushings? And how far could you cheat a cam core? 2,3,4 degrees?

Wonder what Bob Glidden was using for cam cores when he welded his own blocks to 48 degrees?