When does money outweigh sentimental value? 1968 notchback build thread

Installed the intake next and pulled a vacuum on the cooling system. Had a little leak. Little enough I couldn't hear it. So I had to rig up the radiator and pressurize the system. Turned out to be this little guy. Leaking from the nut retaining pin? Don't even know how that's possible. New one fixed though.

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