[Tuned]

Simple re-build and proper re-spring, should do the trick. The valving on the older bikes isn't that far off, they only started doing more radical things in later years. Fork/Shock oil only lasts a few years, it gets corrupt by the spring scraping on the sides of the tubes under compression and leaving little metal shavings in the oil. The shock's oil gets cooked due to heat, so I'd have someone re-build both and go from there!

Happy New Year!