With all due respect, and I'm trying to be nice here, this might just be the most ill-conceived, unlikely trade proposals ever brought up on Celticsblog.
If the Sox can get the equivalent in prospects that they would receive simply by keeping him, letting the contract expire, and getting the Class A free agent draft picks when he signs elsewhere, they would be lucky.
If they trade him without sucking up large amounts of the money owed on the current contract they would be lucky.
Sorry, but the Red Sox are not dealing from a position of strength here. Other teams know that and since the market for teams that would want or need Manny is small, the Red Sox can expect not to get anything close to equal value for him.
I say keep him and let him finish with his 30-35 HR's, 100-115 RBI's, .300 average, .980 OBS and another World Series MVP award and let's call it even.