I'm a fan of Pacquiao, but seriously... Floyd would have destroyed him at 130. Look at how open Manny leaves himself when he throws shots. He would be a punching bag for someone like Floyd!
At 130, Floyd was a physical freak of nature. I say he is a way better fighter now than he was when he fought at 130 & 135, but that is because he has learned lots and his experience has grown (even though he has naturally lost some speed). Although less experienced, he would still take Manny to the cleaners though... I reckon he would stop him around the 8th or 9th round.