I would replace all the rubber fuel lines, blow out the hard fuel lines with compressed air and treat the gas tank professionally (just to be safe).
Also, you won't be able to use a gasoline tank from another member unless it is specific to the Fairlady. When I dropped my gas tank, I compared it with several versions of the US market 240Z gas tanks, and there were several nipples that were different. You could modify a US tank to work, but I doubt that would be any more cost effective than boiling your current tank.
Your car seems to have quite low mileage, so honestly, I wouldn't bother with boiling the car right now unless you want to a Concours example. It is your car in the end, but if I were you I would buff out the paint with compound, treat the few rust spots, and DRIVE it. My Fairlady 240Z-L sat since 1992, I performed all of the above and it is daily drivable today. The paint was faded beyond belief, but I got a good shine out of it, just look at my attachments! It builds character! I do plan to restore it one day, but seeing as Fairlady's with original paint are a rare commodity, I do not mind waiting.
Here is a laundry list of what I would focus on:
1. Boil Gasoline Tank
2. Replace Fuel Lines (hard and rubber)
3. Replace Fuel Filter (possibly pump as well)
4. Replace Rubber Bushings (all around)
5. Fluid changes (oil, transmission, differential)
6. Check Brake Master Cylinder (most likely is no good)
7. Check Clutch Master Cylinder and Slave Cylinder (most likely are no good)
8. Check Vacuum lines
9. Go through engine (timing, spark plugs, etc.)
10. Check exhaust piping for leaks
11. Pull the brake booster and check for reaction disk (search for this common problem)
12. Heater hoses (Engine Bay, and Inside: Trust me, you'll want to do this if you want to keep your pristine floors)
Anyone feel free to add.
As I mentioned to you through e-mail, keep your rally clock and oscillator, save the funds and do it right. Same goes for paint. The vehicle sat for 20 years, it is ready to breathe! I wouldn't mind going up to Sacramento to lend you a hand, but unfortunately that is quite far for me.