Topend help

Sounds like a valve seat has loosened up in the head casting. Thats the only way a valve can get bent without hitting the piston. I take that back... if a guide is real bad, broken or split open, a valve can get bent. I'd yank the head and have a look at the valve guides and the valve seats before starting up that motor again.

EDIT: Replace the valve springs too. They are probably junk.

Refrain from posting adult language please. Thank you.

Check compression, it may have destroyed the piston by now. It sounds like the cam is installed a tooth advanced and the motor is running some severe detonation.