[b-man]

I would put the battery back in the factory location.

I used to have a 1964 GTO that I bracket raced, I put the battery in the trunk. I used 2-0 welding cable for the positive that ran through the frame rail and also utilized a Ford solenoid for sure starting, the battery was grounded to the frame using 2-0 cable as well. I also grounded the body to the frame with a copper strap and grounded the engine to the frame with 2-0 cable, I was using a Pontiac starter nothing fancy.

After racing the car for over a decade with no starting issues ever I decided to quit racing and returned the car to the streets. I moved the battery back to where it belongs, under the hood. Easy access and just better all around if you need to charge the battery or jump start the car.

I pulled probably 20 pounds of 2-0 cable out of the frame during the process. When I was drag racing the car I did whatever I could to get weight off the front end, relocating the battery, removing the front inner fenders, some of the bumper bracing, heater and wiper assemblies etc. I put everything back on the car to make it comfortable again and putting the battery back up front just made sense.