[hx87]

If you dial back on the compression and timing, modern cars would run just fine on 1962 gasoline--probably better than 1962 cars, since electronic direct fuel injection assures even fuel distribution among the cylinders and cools the air in the cylinder, making it less vulnerable to predetonation.

[ptaipale]

This may depend on geographical area and standards and so on, but at least here in northern Europe, much of the gasoline was made of Russian crude oil and before modern emission standards, it contained lots of sulphur and other impurities. I believe modern cars would start flagging errors with even 1980's gasoline (again, even assuming that the lead would be taken away and replaced by modern additives).