This isnt meant to be a smart answer, but why do you have springs if you dont have a cam?? They pretty much have to be matched to one another. I will let the small block guys answer the rest of it...Im not quite as up on the small block stuff. I can tell you this, dont go overboard...that's the most common mistake. A smaller cam will give you much better performance, especially on the street. You wont be happy with a big one. John