the vapor return line is the nipple on the sending unit or tank? thanks dave
https://521restorations.com/b-body/fuel/vapor-separators/I don't know about any current reproduction vapor separators but the ones that were available in the late 90's & early 2000's didn't have a flow restriction & if used as is would cause a low fuel pressure concern.... Adding an 065 Holley main jet in the line returning to the tank solves the issue...