Performed a rebuild today on the 4160. Judging by the smell of the gas contained in the secondary float chamber, they haven't been operational for a long long time.

Perhaps this less than pristine Vacuum Secondary Diaphragm has been contributing to my low vacuum readings:

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC