Your on a very good start with your build.....Well done! ...so far!
As Rusty mentioned...fitment! ... for "ride height" look up an article by Doug Whyte...The Whyte Way (ScaleAuto) he shows excellent tips while building Dale's car....should help you through it.
There is a situation of "which track" those certain pictures represent...you have different configurations for "weight" & "panel strength"....teams had different configurations for short track & super speedways