Classic/Antique Car Repair: Leaded Engine Conversion to Unleaded, society of automotive engineers, unleaded gasoline

Question
Hello, I have a 60 F-100 with a 223 inline 6 with a question regarding fuel usage. I understand that typical unleaded won't cut it for the old leaded engines and that a fuel additive or modification/part replacement is needed. I would prefer to make it so that it ran run straight unleaded. I read a few articles, but they all varied a bit as what needs done to the valves. What exactly needs done to the engine to make it run on unleaded gasoline?

Answer
Ok, here is the way that I see it after following the operation of several dozen old cars and experiences way back in the day. First Amoco and Sunoco gasolines were lead free gasolines way back into the 1930's through the late 1950's and we never had valve problems because of the absence of lead. Secondly several friends of mine in the Society Of Automotive Engineers who are auto engine engineers state that unless you are using the engine under extreme loads like plowing potatoes, heavy trailer hauling up hill constantly or running under heavy load and full throttle all the time that the engine will never miss the lead. The thing that you should consider is having the carburetor rebuilt using alcohol resistance parts. This is due to the 10% alcohol found in todays gasoline.