Converting a 318-360 magnum to adjustable valvetrain.LOL

Got a funny build going on and I'll post pics if it works. Cannot find a reason to think it won't. some smart guy tell me what I'm doing wrong please. I have a mild build going on that uses a very mild solid flat tappet .325" lobe 320lbs open spring pressure and no need to complicate. I thought to modify the stock rocker mounts to allow adjustability. I removed much of the base and drilled the 5/16" to 3/8" to fit the new studs. I am using guide plates with this set up. Seems very simple but I haven't heard of anyone doing something as seemingly simple. I'm guessing I'll figure out why it's not done by all.