LQ9 in 1996 4wd Tahoe

I am looking after the first of the year I plan on swapping in this LQ9 in our Tahoe. I need some heads and a cam before it goes in. I have a Trailblazer SS intake that will run a 90mm throttle body the truck is lifted 3" with 32" tires. It is currently geared with the stock 3.42s. I'm waiting to see how the motor shapes up before I regear. Because right now at 70 I'm turning 1750 and that's kind of nice. Plus the LQ9 will make so much more power over the 350 I might not have too. Three final questions, what size are the primaries on the headers used in the swap, can I use the 4th Gen F body efans on the stock radiator, and will the ECU used once I swap the motor be able to control the efans like in the newer trucks with the Nelson Harness? Thanks

The heads I'm thinking of are like a set of stage 2.5 ls6 heads and a cam around 220/224 on a 114. I want loads of torque and a very broad power band. I'm not looking to make this a race truck or anything just a better DD. I had planned on getting my wife an 07+ Escalade ESV but she loves this Tahoe too much. I'll probably still get her one but instead of around Feb 2012 in might be closer to the end of the year