New K3500 - Need More Oomph

[1972RedNeck]

Just got a smoking deal on a '98 crew cab K3500 with the L29 7.4 Vortec. It has 260K miles but it is CLEAN. Supposedly the transmission was bad - turns out the drain plug fell out of the Borg Warner t-case. $300 junkyard t-case and it runs and drives great.

Been driving it around a bit to see if I am going to flip it or keep it. I'm thinking this one needs to stay and one of my Fords will have to leave .

But as with any vehicle that gets added to my fleet, it needs to have a bit more power than stock. From what I have read, a tune is definitely worthwhile (gets rid of torque management in OD as well, correct?).

What about headers though? I'm not interested in long tubes, but shorties would be an option. I have read conflicting views on shorties, some saying they are a big gain and others saying either go long tubes or nothing.

Thoughts?

As for the tuning, who can get me the best tune for a stock L29? Sending off the computer is no problem if need be.