I just bought a 1978 pontiac trans am for only 500 bucks. Its been sitting behind a shack next to a corn feild for about 3 years. It has the pontiac 400ci engine with the 4 speed munci with the hurst shifter. The body is solid, no rust anywhere and the underbody has been undercoated. The engine looks like it was newly rebuilt, the out side of it is very clean. I turns over no problem. The only thing im worried about is the engine had water in the oil pan. the person I bought it from said it ran when they parked it. When I drained the oil, about a half a gallon of water poured out before the oil started coming out. The oil was very grey and clumpy also. I was wondering if this could be caused my condensation and from it sitting for so long, I really hope its not a crack somewhere. Please give me some suggestions on how and why there is water in the oil pan and what I should do about it. Should I try running the engine or should I pull it and rebuild it?