welcome, I too did the Brum tunnels on the way home from work once, got the thing sideways as it was a bit wet and the car was a bit more lively than I thought....still, soon back under control.
There are a couple of buyer guide type things on here, but main points to watch for are rusty fuel tank, rust around the rear lights and spare wheel well in the boot, crunchy second gear and those wonderful Italian electrics that are mainly German. There is plenty of scope to tinker with your bella, from poly bushes, lower suspension springs and roll bars, to a wide ranges of brake upgrades and putting in the V6 3.0 from a 166.
That said, beware, the cars can become addictive money pits...