I will take a stab at it.
Stock smog motor with stock heads and stock compression - no other real mods? If so, you can use a Comp 268H. That is a default for that application. It works. Headers, converter and intake will help some but are not mandatory.
If you have more mods than that you will need to provide a lot more info. It is important to match the cam to the application and the rest of the setup.
-Mark.