They are good trucks. I drove a '71 9500 that was the same color. I used to own a '67 7500. The V-6 gas is a good engine, but as stated above they are hard to find parts for. That would not stop me from owning one tho. They are also know for not so great gas mileage, but if you super-tune it, it should do OK. It most likely will be a 401 or 478 V-6.
Let us know what else you would like to know about it. I'd be curious to know what trans it has.
Bill