The Mopar 484 and 509 cams were designed for bracket racing. Their good points are that they are cheap, relatively easy on valve springs, and make good mid/upper RPM power. The cons are they have a rough idle and weak low end power.

There are better cams avaliable that can make better power through a wider RPM range. They are a bit more expensive, and usually require using valve springs matched to the cam being used.

The Hughes cams are some of the most agressive profile flat tappet cams avaliable off the shelf.
The Comp HE2??HL cams are good too.
I think the Voodo cams are simular, but I have not used them.