Clunk is probably due to the previous owner putting too big of a spacer up front without replacing the upper control arms. Look on the coil bucket for marks from the OEM uppers hitting the coilbucket to confirm. What you want to do up front will be determined by how you want to fix the clunk. If what I said above is happening you will want to determine if you want to keep the same height, if you do, you will need aftermarket Upper control arms. If the clunk is caused by bad struts then you can replace them with adjustable struts and remove the spacer (depending on how big the spacer is. There are various options for both instances, really depends on your budget.