Anyone try this Lowering Springs and Shocks/Struts combo

Anyone try this setup? Why are some springs for all models, wouldn't the weight of a 5.0 and 2.3 have to be considered? I really don't want to pay $400+ for just Eibach drop springs.
Thanks!

http://www.latemodelrestoration.com/iwwida.pvx?;item?item_no=LRS-5310A-K%20%20%20%201&comp=LRS

Well I just found this set and the price isn't too bad...
http://www.latemodelrestoration.com/iwwida.pvx?;item?item_no=EIB-3518%20%20%20%20%20%20%201&comp=LRS

One of my main concerns is what kind of shocks do I get if I get the drop springs? Are just normal (sensitrack)shocks/struts from my local auto parts fine? Or do they have to be specifically for drop springs. Sorry but I don't know much about suspension.

Thanks!