If you suspect timming chain, you could pull the fuel pump and get a endoscope camera in there and see if you have nylon teeth. Lost a Ford 289 at the magic number of 160,000 to the lame nylon teeth.
IMHO if not nylon teeth probably did not jump a tooth
Just a thought. Maybe you didn't loose power but you damaged your rear brakes and they are really dragging now?
Not sure why people think that (unless they have a line lock) their rear brakes aren't going to get toasted, overcoming all the friction needed to keep the car in one place.