Very nice track that I had no idea existed until just now:
I've raced the 'modern' Interlagos, Brazil circuit many times on the PC via several Formula 1 sims.
This 'older' Interlagos track has nothing in common with the modern circuit: It's much longer. Nearly all of the turns are medium or high speed making for a fast and fairly fun and not very difficult track to trace...with a significant amount of elevation change as well.