I live in Vegas, and had owned a '70 GT-500 for 27 years. This is nothing different than any vintage car. First, make sure everything is in good working order. Hoses, belts, cables, etc. The FIRST thing I would do is the cooling system/fan/shroud, thermostat, etc. A good/new battery/alt, and especially the positive and ground wires are upgraded. Install a new mini hi torque starter. Fluids are topped off, and replaced. A good suggestion would be to instal an alum intake: weight, and cooling are the goals. Carb, its your choice. However, Holley's are known leakers, I'd personally would swap out for a good Carter/Edelbrock verson. Why? set it and forget it, and dead nuts reliable. Electronic ign is a good upgrade. Trans, power steering and possible engine oil coolers. New upgraded poly/bushings for the sway bars, KYB shocks. Brakes: Baer or Wilwoods are good examples. Be careful not to go way overboard with all of this...costs and labor/time can get expensive.