Finally decided on a cam for teen SB. Should I bother with header?

If your not changing the springs, I wouldn't waste the time or money on a new cam.
I think your fun(ds) would be better spent on a quality torque convertor in the 2200 range.
Imho your dual exhaust and manifolds are fine for what you want.

really?
I thought of that, but remember, I have a cam that does not come to life until after 1600rpms. Would it not be far better to start your power band at idle in an automatic?
I have to work hard to break the tires loose as it is. And a TC will help that, it still will not solve having a power band that is at a level that I barely will live at, not to mention I have given up a lot of DCR as well.