Battery/Alternator Kill Switch location

I have a 68 Barracuda that I am building for a mild bracket drag car. I am looking for a decent place to mount the require kill switch. I thought about running the wires through the sheet metal between the trunk lid and bumper, and building a bracket to mount on the bumper but that would be a little tight. I also was looking at drilling a hole the rear portion of the drivers side quarter panel and just have it on the side of the car.

I would appreciate any suggestions and pics would be great.

Thanks in advance.