Help With The Right Cam Selection

The lopey sound you're looking for is a result of intake tract reversion which results from excessive overlap (time when both the intake and exhaust valves are open). The only way to achieve this is with a long-duration cam, which are designed to give lots of top-end torque and power. Here's the catch though; if your car is going to be driven on the street any appreciable amount, it will become a pain in the *** to have a lumpy cam like that. You will need a high-stall converter if you have an auto transmission, and most likely some low (numerically high) rear-end gears. The only way I see out of this is with Comp's "Thumpr" line of cams which are designed to give the lopey sound without sacrificing too much low-end torque, which is what a street-driven car needs in order to be practical, reliable, and easy to drive. If it was my car, I'd go with a cam that has somewhat mild duration (how long your valves are left open, measured in degrees) but high lift (how far the valves are actually opened, measured in thousandths of inches). Mopar Performance cams don't really have that design and are pretty dated compared to more modern designs such as Comp's Xtreme Energy, Lunati's VooDoo and Hughes Engines (which are probably some of the best Mopar cams out there, as Hughes is a Mopar-specific engine builder). If I was you I'd call up one of these companies and tell them what you're looking for and what you have; they'd probably give you the best advice on a cam choice.