Shock absorber opinion

I'm getting ready to purchase some shocks for the 68 Dart Ragtop. I was looking at the KYB Gas adjust. I came across these Monroe coil overs for the rear and was curious about them. My springs aren't great but not bad either could use a little more height in the back. Anyone using them or is this just overkill and better for a truck?
More Information for MONROE 58496