lowering c10 1970, same shocks?

[racosta16]

I bought some lowering springs on CL, but may have been misrepresented. Said they would drop 5" all around with simple install...no spindles needed. So I called a shop and they told me no springs were ever made to drop the truck front 5". I don't know how much these springs will drop the front now. Is there a way to find out? The only thing I could see on the spring looks like 160700??? Sound familiar to anyone? Also, can I use the same shocks or do I need to get shorter ones or any particular kind? I hope this doesn't turn into a huge debacle. I tried to see if there was already a thread for this, but can never get the search to work right and I get thrown all over the web even if I check 67-72...some help on that would be useful too.
Thanks!!!