5 quarts is right. Dipsticks are wrong too. Basically anything that measures anything on a fox is wrong.... lol Why do I love these cars?!
If you overfill by a quart, it's probably not going to kill anything, but I would drain the quart back out if I were you. I've left 1/2 a quart extra in a car with no ill-effects. 1 quart makes me a little uncomfortable, though, but it's still probably ok. The crank will end up with too much windage. Hurts fuel economy, power, and could froth up the oil causing air pockets which is a no go.