Hey. I'm right in the middle of my '77 restore....
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It's a humbling experience! Before I started I thought I had enough answers.... now I have more questions! My first suggestion would be to decide is it a driver that looks good and is functional or are you going car show, all vintage, top notch kinda thing. Just a paint and body scenario could cost from $2,500 to $10,000!
I started with a budget. Around $7,000 I am 3/4 of the way done and my new projection is running $10 - $12,000
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I believe I am getting very good work for what I am paying. Still the market may only pay 1/2 to 2/3 of my cost should I want to sell. To me that is OK. I love the car. It gets comments everywhere I go. It's fun! So for the extra 3,4 or 5K I over spend may come out to maybe $400 per year over the next decade of driving. Nothing for what I have. Cheap entertainment!
One other thought on values is that FIAT is making its US comeback with the year bringing back the 500 mini....... if its a hit like the Cooper the FIAT name may regain some of its interest. I still have a hunch at the prices you can get one now for it may be a bargain, a real bargain.
Just remember in the car game you usually do not get out what you put in. I went to Barret Jackson last week in Costa Mesa. I saw 40, 50K resto jobs selling for 20, 30K's........ if you want to save money buy a finished vehicle!