A rough idle is over-rated. Never understood the fascination with that. Get a cam that will work. Nothing better than a stock idle and balls out performance. I'd call and have a custom cam ground for your application. If you want an off the shelf cam the VooDoo 533 is probably your best option. The 472 is a good way to go. They seem to run strong and are reliable. The 750DP would be best, intake is a good one as well.