No one probably has any idea why it was parked 30 years ago. Maybe it had problems or maybe they just didn't need it any more. At the very least you will need tires, battery, carb rebuild, points and plugs and I like to install new gas tanks. In fact don't try to start it on the gas that's in it. Stale gas causes valves to stick and they can hit a piston. The items I have mentioned will go over $1,000. I would be hesitant to pay over $1,000 to begin with with all of the unknowns. But be careful. You may insult your friend. Many people look at the asking prices on restored vehicles. However, the asking price is not necessarily what it will sell for. And there are a lot of $ between a non runner and a restored vehicle.