[Flairbird5]

I am buying a 65 T-bird and dont know what has been done to the engine in the past years but it looks to be nice and clean considering its only 2900 dollars, texas car so there is also little rust... But what do people do so the engine isn't harmed by using unleaded gasoline?? I am a member of altimas.net(99 altima) which is the opposite of this car(65 t-bird),,,,,any help would be appreciated....thanks