IMHO I feel it's more important to not over cam a motor. You can under cam a motor and not suffer as much as if you put in a too big of a cam. It all depends on how much carb and manifold you have, size of you heads and valves ,and your compression(bore&stroke). I may be in left field but the higher the compression, you may want more duration than extreme high lift. I like the 280 range cams for street, I like the rougher idle with about 10:1 compression ratio, makes the motor sound awesome! You can always put a bottle on it too. Find the perfect combo and you will have a very strong running motor.

Now since I know there are many here that are more knowlegdable, please jump in and help me out. I'm getting ready to do a 400sbc and I want to do it right.