First, you cut a hole in your trunk floor.

The battery takes up too much room next to the radiator, and so must go to the trunk. This will also substantially help with weight distribution. My trunk floor was really rusty, and so needed a patch panel before I could feel confident in putting the battery box on top of it. Moving the battery to the trunk is also motivating me to clean up the wiring underhood, so hopefully that will look much cleaner at the end of all this.

As for the...

How to install a bigger radiator in your '65-66