Factory Battery

The batteries like that are junk. They won't last and are insanely expensive (if you can get them, last I knew they were backordered). Most just put them in the car at the show and put them back in the trunk when they leave. I use the battery toppers and a modern Deka group 24 battery.

Example:

https://www.musclecarparts.cc/1966-...rz9swoT-khIYRmch4Q0eRnrpWe5ELWSxoCGxIQAvD_BwE

You can get Red, Green or Yellow caps (cold cranking amps) caps. Have them in all my cars (note Year One make the upper hold down that is just a but wider to accommodate these) and _very_very_ few notice it is just a topper.

Jim