1971 Dodge Dart 318/904 trans ***CAMSHAFT OPTIONS***

Hello I'm new to the forum and in the process of swapping my cam, would like some input on "Camshaft" options. Below is a short manifest of current vehicle modifications. Any input or insight would be greatly appreciated. This is my weekend car and simply looking for a bit of performance and sound enhancement that usually come with upgrades. Preferably a mild Cam!

* Edelbrock performance 600CFM 4 barrel.
* Edelbrock performance 318/360 manifold.
* Edelbrock Elite Air cleaner, 14" round.
* Doug Headers
* Dual exhaust w/x pipe and Flowmaster: 40series.
* Front tires 215/45/17 Rear 235/45/17
* Heads and springs dead stock.
* Automatic 904 transmission.

I'm sure this is a familiar or repetitive discussion, but I figured someone might be able to shed some light with the information provided.