I recently found a NOS dashpot on Ebay. I want to say i paid around $30 for it. It's a Borg Warner, which i suspect was probably making them for GM anyway. My car started out the same as yours, 65 Lemans with automatic and factory air. It also had the 2:93 rear axle.
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"I know just enough to keep me here, but not enough to get me out"
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