Sb 400 question

[neonlarry]

I was in Pick and Pull today, and I saw a chevy small block lying on the ground, all that was left of it was the crank, rods, pistions, and not much else. This is what mortech said about the casting number 3951509....400...74-80...2 It also has 010 under where the timing chain would go. I couldn't see anything wrong with it, and just from what I could see, the cylenders don't show much wear. I have kind of been looking for a 400 block for a while, and I was just wondering if this one would be worth buying, or if I would be better off looking for something better.