75 Scamp suggestions

Hello, I am 16 about to be 17, and I have had a 75 Scamp in my family since about 91 or 92. At this point shes sitting in the drive screaming for help. As far as I know at the moment, it needs a new brake line, new brakes and rotors, a new battery, a new power steering pump, new tires, and of course plenty of body work. It is an automatic 3.6L? Slant 6. It does have a good bit of body rust toward the point where theres holes in the trunk area. Id like to know if theres a better way other than Bondo to fix body rust. Also I would like to drop a 318 with a 4 speed tranny MUCH later down the road. But sticking with the automatic, is there any performance parts I can put underneath the hood that wont eat away my engine and trans? Also what would be a good color paint for a teen that owns a TRUE american muscle car? Thanks