Yes, I remember "The Rumble" and "The Thrilla", 3Ts.
I also recall that there were just 10 weights each with just one world champion, all of whom I could name. Today I could not even give you the name of one of the five or six people calling themselves the world heavyweight champion.
Even at the lower levels and lesser weights there were some legendary names. Among the British fighters were Dave "Boy" Green (the Fenland Tiger from Chatteris, Cambs). I will not forget his brave expolits and in particular his bout against Sugar Ray Leonard. Leonard lifted him off the floor with an uppercut to knock him out. Many watching thought he was dead. John H Stracey was also from that era as was Carlos Palamino.
The heavyweight scene was always the most glamourous and apart from Ali there were Smokin' Joe Frazier, Ken Norton and not forgetting Henry Cooper and Joe Bugner. I should also mention Brian London. When frustrated by the sport's politics which saw him unable to get a crack at the world title (and to be honest he was never in that class) he remarked "I'm just a prawn in this game".
Happy days!