The 79' does not have a computer. It does have a knock sensor that triggers spark retard when it senses knock. I think what he meant was that higher octane fuel will help suppress detonation. If your spark retard is not working and you are running at stock boost pressure it will definitely be safer to run higher octane fuel. Keep in mind that the higher the boost, the more chance of detonation and there is a point the extra octane won't be enough to help. I know of a few guys that have done away with those antique spark boxes and run race gas with mechanical advance distributors in race only applications. I'd be afraid to do that on a street car. Although I haven't personally tried one, The J&S Safegaurd system seems to be best way to control detonation on the old hot air cars.