Ambers are on my shopping list

getting the important parts done first though.
It looks low at the back because it is mate! Even more so with the kids and luggage in the boot. Thought I was gonna lose my exhaust to a road full of speed bumps earlier, took 40 mins to go quarter mile lol.
Ive not a clue on suspension set ups, not a fanboy of slammed motors I just want one that can handle some weight in the boot!
These any good?
http://www.burtonpower.com/parts-by-fitment-type/parts-by-car-model-ford/ford-sierra/pakspax-kit-sierra-cosworth-2wd-86-90-spxtap042.html