[Blue Bowtie]

The 262 V-6 is a far better engine than the likely 3.4L V-6 in the Lumina APV. The 4L60 transmission in the Safari is very reliable. However, at 230K on the clock, there is no one who can say that you won't have trouble with it. Either is a risk, but I'd lean toward the Safari given that choice.

In my experience with the Lumina APV (Pontiac Trans Sport, Olds Silhouette), they are less maintenance friendly and more maintenace intensive, especially as the mileage accumulates. The body is also less substantial. The transmission on the wrong-wheel-drive Lumina is barely adequate for the mass and size of the vehicle, and the steering and front suspension systems are weak points.

The fact that the Safari has a valid safety inspection and everything works is a good sign. The oil leak could be a minor problem, or something more significant. If it holds oil pressure and doesn't leak out a quart a week, it may be worth checking further. Common leakage points on that engine are the 'O' ring on the oil filter adapter/oil cooler line set. They are relatively easy and inexpensive to repair if you have only basic tools.

As for having the "heads done" I would suspect the valves were ground, stem seals replaced, and hopefully the springs replaced or at least shimmed.

Just for comparison, I can't even buy a used engine and transmisison (running) around here for $500.

At 230,000 miles and 14 years, I would expect that it would need shocks, an idler arm (loose steering), and probably several other things. Since we aren't there to inspect it, only you can determine whether it is worth the price. Still, $500 for anything that runs and is complete is less than the going rate around here. What was known years ago as the "Hundred Dollar Beater" is now the "Thousand Dollar Beater" in these parts.