It would make me nervous too. Can you reuse the old inner seals? There is nothing wrong with that if they are intact. I have personally used 20-year-old factory inner coolant seal over in another build and they held up just fine.
If they com out intact, they are probably not brittle.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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