I can't speak as to pricing for the Urraco. I have heard of prices ranging from 20-35K.

I will give you this bit of advice. Do with it what you will........

Find the nicest, most complete, most mechanically sound car you can find even if you have to pay extra to get one.

In the long run this will save you time and a LOT of money and aggravation.
The concept of doing the restoration work is fine........for a Ford or Chevy where you can actually find parts. This may not be the case with the Urraco.

Just for the heck of it spend a couple of days trying to find a distributor cap and rotor for the car. Next, check into finding a clutch assembly. Now, if your a real glutton for punishment try to find an OEM brake master cylinder.
When and if you find the parts, check out the prices. You may get a little sticker shock.

Trust me when I tell you this, find a very good car and OVERPAY for it. It will be cheaper and you will be happier in the long run.