I have had good luck with Craig at BDS on three seperate blowers. 1-was a 6-71, an 8-71, and lastly a 10-71, and none gave us any issues. I also purchased my FAST efi thru them way back when and they were great at supporting it. Can you be more specific about what was wrong with them?

Also to 6packgut, the modman intakes will support roots blowers, but I would look at a whipple and mount it on one of those intakes. Less heat, more boost, and just sick instant torque. They have one that is a direct replacement for a 6-71, but it might make a little too much boost for street. Also, there are you tube vids by a company that has been putting BDS blowers on these new Hemis and making 900hp on pump gas CMN motorsports I think...