Cam wiped out, what the hell did I do wrong?!?!?

Sorry to hear about your missfortune...

The first things that come to mind is too much spring pressure on start up and second is lifter bore index is out or too loose...
One other thing is that taking a HONE to the lifter bores is a no-no...some 320 on a flapper wheel for a polish is all I use.
The ramp on your cam is really not that aggresive...probably low 140ish@200.
Problems tend to start at 155@200 with flat tappet cams or at least from my experience that's where block issues come into play...ie lifter bores to loose and bore index issues.
See if you can find a broaching tool to check the lifter bores.I've seen the tool fall right out the bottom of the bore on many occasions.