How adventurous are you?
Bend up some ½" annealed copper tube, bead the ends and have it plain zinc plated. You could run two lines; one from the the water fitting on the passenger side head front, to behind the carb spacer - and the second from forward of the carb spacer, to the water pump. A one inch "joiner" of rubber at each end would protect the copper from fatigue by vibration.