possible to reach 400 hp?
Supercharger?
Nitrous?
Turbo?
If you plan on any of those, heads and cam are still an important factor, but are not near as radical as on an N/A setup.
With a supercharger on a stock car it will net you 450+ on low boost.
I would suggest you check out the stickies for more of the information.
But to get you started. You could run a huge cam on stock heads with new springs and retainers with hardly any problems at all. You are going to want to get this thing tuned even with a bunch of bolt-on's.
But Your best bet being an A4 would be a nice TQ converter. I would say that this is going to be one of your first major mods.
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here is a really good explanation/write-up on how a stall works. http://www.bankspower.com/Tech_under...rqueconver.cfm
I would check with just about any of the sponsors over here --------------------->
But if you want an opinion...I would say call Patriot ,Thunder, TSP, Futral, Speed Inc, MTI...ect for the best qoutes on prices. They will also be extremely helpful in having you chose a combo that will yield the results that you are looking for and even tell you what the appropriate stall would be depending on your selection. BTW: There are a lot of good prices on heads right now. Patriot has a pretty slick deal on some cast LS6 243 heads that are 100% CNC'ed.
You can get better track results out of a bigger stall, but it does affect how the car drives in town. If your car is loud (like mine is) and you have traffic ***** in your area, revving to 3k at the stoplight is not a good thing!
TR's 224 cam seems to be pretty popular, makes fair power & is easy to tune. GM's Hot Cam makes more power than many like to admit, but it's not a good idler, especially without a stall. And Cam Motion will grind a cam spec'd to your car for a little more.

