So here is my dilemma, I never owned one but I just bought a 1986 Mustang 5.0 lx convertible as a project for me and my 9 years old son. I would like to do some upgrades, motor wise but don't know where to start. Should I start with a general tune-up? oil, plugs, wires, cold air intake. ideally would like it to roar a little deeper, would that be headers and if so what would be a good choice?