Put LeBron in the 80s, he is bitching about getting pummeled every night. Put LeBron in the 60s, and he doesn't get through a offensive series without a travel being called on him.
He is an incredible athlete however his game would have not worked in the past. Travels far too much and complains when he gets touched at all. Imagine McHale clotheslining LeBron then the ref calling LeBron for the travel before that.
I have no doubt that he would have adapted his game to whatever the dictates of the day required and been a dominant player because he understands the game so well.
If McHale had clotheslined LeBron, McHale would have gotten banged up the most. He is a beast.