We should assume your new radiator has a new recovery type cap on it too. Adding that plastic bottle to my 67 is one of my best/favorite moves. At least 2 years since I last removed the radiator cap. A glance at that bottle tells all.
I know this is ancient history, but what kind of “plastic bottle” rig did you set up? I want to add one to my 71 demon. The radiator overflow tube goes towards the driver side, where the battery is also installed so there is little space.
Thanks
Al Graham.
