Indeed you can't, and obviously I can't gainsay your own memories. However I went to nearly every game, home and away, in that era and I never once heard anybody sing anything other that 'Going up and we'll win the Cup". Never, never never. I remember May 1983 with people singing quite pointedly...
No. He wrote "Going up AND WE'LL win the Cup". It got changed to "Going up to win the cup" as a one-off specifically for the 1983 cup final - and for some inexplicable reason it's stayed that way ever since.