I thought the same thing about the line size, but if we are redoing it, there is no kill like overkill, right?
Being a '66 it has a vented tank and not a vented cap. the vent is clear.
so far it can't be duplicated on the street, it really falls away at the top of 2nd and with trafic around here you can't stay in it long enough for it to nose over.