lost RX-7 Key

hi im the one buying the 200k miles onthe 85 RX-7 the guy toled me that he lost the key and that he tryed the lock smith to make him a key using the door look but it did not work the deler wont make me a key cause its not my car the the person who owns the car dose not go to the town where the mazda dealer is so how can i get a key done or get a look asembly for a 85 rx-7? and can some one tell me what Liter this car would be and how much Hp it would have and it theres a good driver behind the weel would it smoke a 88 mustang 302 tween cam ?? o ya the driver or the mustang is not the best :)