I was at the 1970 12 hours of Sebring. Mario Andretti won in a Ferrari 512m. I can still hear the sound of that amazing 12 cylinder engine. I as 14 at the time and my brother and I and his friend drove there in my parents 1965 Chevy station wagon with a straight six and 3 on the tree. After the race, they let you drive the circuit. The brakes lasted two corners. Those were the days.
The other thing I remember is that the track is 5.2 miles and there was a 6 foot deep ditch all the way around the track. After the race, that ditch was overflowing with beer cans. What a sight.
That is a race I will never forget.