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I recently put Monroe Sensa-Trac shocks on mine. If I remember Sears was running a rather regular sale of free installation and a decent price. I think I paid around $120ish for the set of four installed. I'm quite happy with the ride.
Good luck with whatever you choose :cheers:
Before I did major mods to my 81's suspension, I went with KYB gas shocks, at $30-$35 per. Vette Brakes & Products has a specially valved version for monospring rears (if your Vette is an automatic). At the same time, I put in the factory rear sway bar (7/16"). If you don't have the optional 255 tires, I also recommend putting them on the next time you need rubber. With these relatively inexpensive mods, the car handled pretty nicely, even when being flung around the track.
I run KYB's and have been quite please with their performance. Summit sells them for about $120 for a set of four. All of the Vette mail order catalogs are higher on these than Summit.