[techweenie]

If i understand correctly, the Ruf modifications are to the original engine and include the addition of a 5-speed transmission (or is that a 5-speed conversion on the original transmission?)

In any case, the above Ruf modifications would not be detectable visually.

$2K must be a small fraction of the asking price.

So the best advice I can give is to observe these issues 1. you mention the color combo of the '79, but not the '83. The colors of the 79 are very very rare and unique. 2. '79 was the last US imported 930 for several years. The '83 would have been a gray market import. After 30 years, that shouldn't make a difference, but there are a few nervous nellie Porsche types who would knock the car for that reason. It could impact your ability to sell when/if that day comes. 3. Porsches are not Chevys. You need to use the "butt gauge" when buying one. The one that feels tightest would get my vote. It's unlikely the two cars will feel the same.