Are the duration numbers you list the advertised duration? If so, and since its a Comp stick, I believe you have a Comp 20-604-9 which is actually a relatively tame cam that many people are successfully using. [The KRC 210 cam family is based on it.]
If this is the case, your duration at .050" is 210/220.
As others have mentioned, you will want to change your valve springs, the MOPAR .600" max lift springs are a good choice price and performance wise.
The Rhoads lifters that you have are an excellent product for use with an aftermarket cam. As I'm sure you already know, the Rhoads lifters reduce lift and duration at low RPM's, pumping up to full lift and duration by 3000 RPM's. This will give your cam even better street manners by increasing low end torque and vacuum. Unfortunately I don't have any hard numbers for you as far as vacuum and torque increases from the lifters, however other users on this and other Dodge boards have rated them favorably.
So, as long as the duration numbers you listed are advertised duration, you have a Comp 604, and a very streetable cam that you can install and enjoy.