Last week I jacked up the rear of my '69 and when I walked around to the front there was some gas leaking out of the right side (passenger side) of the front. There is a rubber hose about 4" long close to the top A frame bushing that connects the steel fuel line that comes form the tank to the steel line that crosses over to the fuel pump. That short piece had a hole in it. The hose is probably about the heignt of the top of the tank. Not sure if this is your problem but worth checking.