Get you a Chevy High Performance manual. That will discuss alot of chassis theory in detail, at least the old one did as I haven't seen the newer one. The put ackerman angle in very basic terms picture this. when you turn a corner your wheels follow an arc. These arcs aren't the same radius. The inside wheel turns in much further onmost applications than the outside wheel.
In racing applications(drag) this wouldn't be of much concern to have as you are trying to reduce drag as much as possible. In oval racing(nascar) they try to reduce it as well on big tracks to reduce the drag but on places like Bristol they we put more into the car to reduce the amount of wheel input needed to turn the car. Oval racing too much wheel input will unload the left rear and around you go. It is just one of the many small adjustments they make to dial the car. Decreasing this angle slows the transfer of weight as well. On a street car you just won't notice much change and I would stick with a standard set up that comes with many of the kits on the market. What type of front end are you thinking of going with?