64 Dart 273 Engine Vacuum

Vcode said

What should the vacuum be on a 1964 Dart 273 - 4bbl with 4-speed have for stock engine.

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That will depend on:
Ignition timing,
Idle-Rpm,
Engine load during testing,
Cam timing,
Cranking cylinder pressure/compression ratio,
elevation, and
the exhaust system.
Especially the first two or three.