I have that exact case, the SATA / SATA power connectors are indeed a tight fit. I actually knocked the power connector out of the socket the first time i reinstalled the rear side panel.
I am assuming you mean SATA not old school IDE connectors.
Getting SATA cables / SATA power extensions with the 90 degree plugs helps a bit. Pull the cords down below the drives and loop them from below to get rid of as much slack as possible in the empty space between the cage and the PSU, and attach the cables before locking the drive into the cage.
If you are talking old school IDE, the molex power connectors would be very difficult, I would buy molex extensions that have a 90 degree plug.