Okay, first off, the Hotcams valve lash is too large. Adjust to .004". Second, if you put aftermarket O-rings in the cam and valve covers, they may be smaller then factory. I've had this issue with the Cometic O-rings, and had to squeeze a bead of rtv over them when installing the covers. Third, you probably didn't damage anything far as the engine screaming for only 10 seconds. Next time, just turn off the ignition switch, lol.