Good Deal on a 383?

So a little bit of an update... I've been trying to get a hold on the seller for the past couple days and he finally replied back. He's been busy with work and since this is my last week of school before my finals next week, I asked him if I can look at the parts on Saturday or sometime late next week. What are some things I should be looking for with regards to the engine, transmission, and rear end? I am a noob at looking and buying parts so remember to keep that into consideration.

As Jim mentioned earlier, it doesn't really seem like he knows what he has. Here is one of his other ads where he thinks he has a big bolt kit with KH calipers... Although, I wouldn't mind those spindles.