I've been doing that to my 76 280C. I started with the things the car needed in order to run properly. In my case, the brakes since it does need to stop and it wasn't. I then proceeded with tuning the motor, carb, plugs, cables, coil, etc.
Then I went on ahead and redid my suspension.
Salt and peppered in there were cosmetic things and stuff that broke along the way.
I am out of town for a while so the car is at my daughter's house having my son-in-law fix every spec of rust in the car....seen and unseen.
I know that I am spending more than the car is worth or will be worth but... I, my son, my daughters, my brother LOVE the car so I don't care how much I spend or will spend. This car will never be sold since it will stay in the family forever or until it falls apart, whichever comes first.
BTW my son learned to drive in this car, he was 12, he's 25 now.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT