if i can give you my 2 cents...on this..
if you got a shock that old and its a single adjustable shock..there is good chance it may not be rebuildable...even if it is, for what it would cost you you would be better off (IMO) To buy you a new set of single adjustable shocks between $250-$300..
contact Autofab race cars at 410-796-8777 ( they run a pretty good deal on their new shocks)
i had a set of double adjustable Koni shocks rebuilt this past year by Koni Industries and it cost me $300..only reason i went this route was because each shock was close to $500 a piece to replace new... if it had been a single adjustable shock for under $300 a pair...i would bought a new set hands down.
My 2 cents
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "