If you want I can measure my springs which had a nice ride height on my 69 convertible 400 car. I have them out and decided to clean them up and reuse them instead of a new set which I could have the same problems?

I believe them to be originals OR very old replacements say from back in the 80's? There are no markings on them as far as I can tell.

I went ahead an measured exacting 17" from tip to tip.