good chance with Fernando or Yossi late on," he added.
"They (United) didn't create too many chances but they were always dangerous. It was close but the little things make a difference."
Without being close to its best, United ensured it will remain top, at least until Wednesday night when Chelsea play Portsmouth in its match in hand.
And whilst Rooney is gaining most of the plaudits for his goalscoring feats - he now has 33 following his 12th-minute equaliser - and man of the match Darren Fletcher emerged quite some time ago as an influential figure in the midfield battle, Park is also emerging as an unlikely hero for United.
The South Korean is ideally suited to Ferguson's preferred formation, with Rooney as a lone front-man.
And his diving header to cement all three points was testament to his willingness to run.
"Park is one of those players we can give roles to," said Ferguson.
"He has such intelligence and discipline. Today we found another role for him that was slightly different but was really important for us."
"He is such a brave little lad that his courage got him the goal."
As Carlo Ancelotti's men still have to come to Old Trafford at the beginning of next month, Ferguson's side are in charge of its own destiny.
Now Rio Ferdinand has revealed the full extent of the back injury that kept him out for three months - and from which he has now fully recovered - and, for the first time in four meetings with Liverpool, Nemanja Vidic managed to avoid a red card, Ferguson can look forward with confidence.
"We have a very experienced back four, a very experienced goalkeeper and that gives us a real outstanding chance, albeit with seven difficult matches - but we have all got difficult matches, so what does it matter?"
"No-one is going away. We are all knocking on doors."
"If you look at the run-ins for the teams, it could very well go to the wire."