If you want the best chance of this working then you must use 80 conductor with only 2 connectors (one on each end)
I have a 6' IDE that works flawlessly. I did have a little bit of intermitant trouble with it in the beggining but i found the problem. Make sure you keep all power lines from the Power Supply as far away as possible.
When I routed the IDE cable i used Zipties and Ziptie anchors to keep it from moving around and i folded it in half to make it a little smaller and easier to route.