Well with out a car you don't have much of a project.
why not get the car then worry about the hub to ground height
or got to tire rack.com and find the tire you want 275/30/18??? which is 26" tall??? and then the hub to ground height will be 13"
if you choose components that have adjustable ride heights then you can get the stance right where you want it.
don't want to sound like an ass but you gotta "grab the bull by the horns" and do it.
