Something to be said for both vintage '82 Konis and newer design gas-shocks from this century. I've run both and the gas Konis are lighter; aluminum bodies save another 12 oz per shock. They use cheaper ($50/pair) easy to find springs in 5 lb stiffness variations and work harder without getting hot because of the 250 lb internal gas pressure and better oil. The gas pressure adds 40 lb of "spring" stiffness, too. And of course the adjustable spring perches make rake adjust-ment & corner weighting easy. Road noise is unchanged using more precise-handling metal rod-ends instead of the failure-prone rubber bushings. I like them.
But if you don't run your car very hard, all that is unnecessary. Gas Konis are not made for obsolete mid-engine Panteras but for an unidentified front engine car with the same shock-stroke. So you need to install the stiffer 'fronts' on the rear and vice-versa to get the valving correct, swapping the rubber dampers end to end as well. And each end of each shock needs a pair of custom spacers (16 total) to keep them centered on smaller OD bolts, that are a sloppy fit in stock Pantera frame tabs unless you shim them. I also find their external damping adjustment trickier to use than the old ones. YMMV-