this is what i found and what i did. I bought the strange struts after talking to a suspention guru that imo is the best in the buisness. he has never had anyone complain about the strange struts. i asked questions on the web about them and never got a bad responce about them everything was good. I was having problems with my 60 foot times and this was one of the things sugested to my by sevral people. I had a set of comp eng 90/10's and changed out for the strange units.
something to consider strange only makes thier struts to work on a 87-93 v8 mustang spindle. so if you have like i did a early stang or a car the was a 4 cyl car. you will need to change over the spindles and bigger brakes to use their product. this is a cost i did not figger so this gives you something to think about.
for the cost you cant beat it buying it directly from strange they cost 111.95 each 8 dollars cheaper than jeggs. i thing they are a great bang for the buck.
i dont know anything about your springs call strange talk to thier tech line they should know. also the strange struts are not gas charged like most struts. not sure on thier rear shocks i use a comp eng. three way adjustable shock. and one day will go to a coil over set up in the rear.
anyhow good luck Pat