You might have to have a manifold built if you want to use a water to air style intercooler, you might try getting one off a ford lightning or 03-04 cobra. I have done quite a bit of work on a lightning and can say that the aftercoolers used on those are quite large and have even considered one for my LS4 project but I have to worry about fitting it all under the hood and it would be quite difficult since the aftercooler sits down inside of the intake manifold plenum and is atleast 4.5" tall if I remember correctly, so you can see in a car application you can easily run out of room with that setup.
As far as a stand alone ecm goes I would stay away from haltech, their customer service in the US leaves much to be desired, many of the people I know that were haltech vendors now stay away from the product because of their lack of proper customer service in the US. I'd reccomend either Autronic or even Performance Electronics. I'm not sure of the website for autronic, however I do know PE's, its
www.pe-ltd.com, In my opinion they are a very good company, infact, we use it on our Formula SAE race car that revs to 14,500 rpm and is extremely quick to change rpm, and it will easily keep up with the motor and is relatively easy to tune.
As far as cams go I would just leave the stock ones in there unless you can find someone that specifically makes blower cams for it. The stock cams you have are very low overlap which will make for good forced induction cams. I would stay away from naturally aspirated cams due to the fact that a high overlap cam will just force whatever boost you make right out through the exhaust and reduce the amount of power you can make, and kill gas mileage.
