Recently I got to thinking about 1970's Saturday Morning cartoons.
I'm not old enough to remember any of the cartoons from back then firsthand, but after doing some research, I'd have to say the best 1970's Saturday Morning cartoon was H.R. Pufnstuf.
For my money, any show where the main character is a helpful dragon named H.R. Pufnstuf, you just can't go wrong.