I know some have said our 60' should be left alone
It's your car - don't worry about what other people tell you . It's just a car .
If the springs are fine I wouldn't change them yet . If you want to raise one end a little you may want to consider aftermarket rubber spring spacers. They work fine . If you want to lower one end there are reversible metal spring spacers that can be used to clamp the spring down.
I'd get it on the road first and see how it drives before changing any springs .