Keep a good grip on all your bags/money/watch in Lima. Avoid street money exchangers. Dont dress like a fat cat gringo and keep low profile - see Foreign Office Warnings to Travellers in Peru you may live to get as far as Cuzco.
The wonderful thing about the dry, no rust, climate of Peru is the preservation of old cars - Model T's etc. still being driven, so theres a good chance you might find the odd classic A/c - Spitfire etc. in a cave/shed.....unfortuately local laws will not allow export