I have installed an aftermarket overflow unit in the space next to the battery...basically hidden by the pass. side front fender. The hose runs under the battery box and is well hidden. I believe there were factory overflow tanks available that will fit the 71 Nova....they may have been an option for A/C equipped cars and/or possibly for cars sold in the southwest or desert areas with high heat conditions. I have seen photos of them before...I think they look like this...they mount to the inside of the fender and fit over the contour of the inner fender...wilma
