Speaking just 90 minutes before tipoff of Sunday night's showdown between teh Celtics and Magic at TD Banknorth Garden, Kendrick Perkins said the Celtics are not nervous about a fourth Game 7 in the last two years. He they’re not exhausted either. “Yeah, we cool. I don’t think it’s a problem,” Perkins said of the team’s stamina. “I think guys have a lot of energy. Our bench has been playing well for us of late, Scal has come in and gave us some productive minutes, Steph has come in and played well. I think guys are alright. It’s the playoffs so you’ve got to find some type of energy somewhere.” The winner gets the Cleveland Cavaliers in Eastern Conference finals. For full coverage, visit the Green Street  blog.