[CaliforniaBorn36]

I second rotorwrench's idea. Take a soda bottle and a few twist ties and mount the soda bottle at the end of the overflow tube. I did this with my '36 and can always catch some overflow. Pour it back in the radiator and the level is as it was before. Since it does that, I run a little less coolant and the engine does not overheat or overflow. Found it's own level which is just barely at the top of the tubes.