1975 duster
If a race only car start cutting everything in sight. All hood, trunk and door bracing all hinge springs, dashboard ( I gutted mine and saved the shell) light weight wheels, front tires, remove any undercoating, all seats install 1 racing seat, bumper brackets use lightweight steel or aluminum tubing for brackets, headlights and associated structure. Use a fuel cell and motor plate cutting all engine mounts off K frame. this will get you below 3000 lbs the add 500+ horsepower engine of your choice and suspension to match and you have a 10 second car. Cost 12 -15 K Now go do it!