Years ago I spent several days photographing Pompeii using Ektachrome 64 without any exposure problems. After all at 1/1000 @ f22 it would have to be pretty bright to over-expose. Shortly after my visit there was an earthquake so my pictures might even have historical value!

I agree that you must also visit Herculanium. It is fantastic and much less known about. Being buried in mud even the woodwok has survived.