Hiya
Thats a very nice Fiat 131, at least from what I can see on the photos. If the mileage is genuine thats a bonus but the real indicator of value is the condition the car is in and 2 doors like this dont come along often.
What's it worth? You are in a different market to Europe so it's hard to say... but I'd think that nice tidy original 131s come up for sale in the USA perhaps less often than here, plus you dont have international shipping costs to consider.
If this car matches your requirements I'd be prepared to pay a reasonable sum to secure it - At least up to $3000, and if you have no competition you might be lucky and get if for a lot less.
Let us know how you get on....and it looks like you are getting thew wheels that you want!?