[FireEngineMike]

I could not find the answer through searching so I started this thread. I am replacing two sad looking battery cables and an even sorrier looking starter cable and going to 00 gauge for the new ones per many recommendations. I want to add a ground wire from the body ground to the starter bracket while I am ordering cables.
Do I have to remove the starter through bolt to accomplish this?
Does it go back together easily? I cannot afford to open a can of worms. It has to be as easy as anything ever is on a Flathead Ford.
If not there, where is the best location to mount the starter end of the ground cable?
What diameter lug do I need on the starter end of the ground cable?
Thanks for the help.
Edit: The truck is 6-volt positive ground.