Heep --
You do this the "old fashioned way" -- jack it up - put it on jack stands (6 ton rated not the cheapie 3 ton junk) --- lower your jack -- put it on some good very solid wide boards -- and jack it up some more - until you get it to the height you need/want.
REMEMBER -- floor jacks have wheels - they MOVE when raising the car.... so make certain you have ADEQUATE area under the jack.... both front and back and side to side!
That -- or you break down and buy a floor jack like I did a few years ago -- it goes to 32" but they ain't cheap!
http://www.ohiopowertool.com/P-610-n...ck-71155b.aspx