Test fit the body often, you'll find it set way to high. I usually lower the top of the cage at least 1/8", just depends. The instructions can be vague, but test fitting will take care of it also. I like to change up the hood also, but the kit one will work.
Here is a link to one I did with a Gremlin body, http://s176.photobucket.com/albums/w184/fredjames_2007/Tobias%20Gremlin/