I was in Iran last year but came from Turkmenistan. Iran itself is everything people say, impressive architecture and warm people. You do need a carnet de passage en douane to enter the country, but this should be no problem from your motoring association. Of course you also need a visa.
There are lots of posts dealing wth the route in Southern Pakistan below the Afghan border, Pakistan police have been escorting travellers and guarding them in their rooms at night.
My own experiences backpacking up the Karakoram highway were only good. They are still the best mountains in the world as far as I am concerned, and I played a little cricket in Sost with a home made bat!
There are a few passes that have a bloody British history to them, The Great Game by peter hopkirk mentions a few. Were you referring to the "great trunk route"? between India and Pakistan.
I dont know any rally routes.
Close to Antarctica and a long way from reality