do i need a cooling system resovior ?

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.
My original 67 radiator has over flow tube to right side. I had to relocate 1 of the 2 horns to mount a small hex shaped bottle from Advance auto parts. I guess you can route the rubber hose around and to the right. I dont think you would want a lot of moisture near battery terminals anyway.