Leaking Coolant

If it is the nut and bolt that holds the intake and exhaust manifolds together under
the carb you can take that off (if it don't break) after you remove the int/exh manifolds
all at one time (together) I believe, But if you are talking about a manifold nut you will need a 1/4'' drive ratchet with a extension along with a swivel on a socket, or a swivel socket

I hope I typed this out so you can understand it