what are both you referring to ? float bowl OVERFLOW tubes ? OR..... carburetor body VENTS ? both can accommodate hoses.
pinback used the term OVERFLOW, which for me references the float bowl. overflow is the Honda term used in parts books for the float bowl overflow tubes.
per Honda parts book, "overflow tubes" are not shown in the early 69 parts books. in fact, the early books show no tubes for overflow but also no side vent tubes. K1 parts books call for "overflow tubes" be used beginning E29,794. Do either you guys have parts books to reference ? the 71 parts book shows side vent tubes in the sketches, but does not reference the vent tubes with a description or a part number.