Can't figure any reason to connect a manifold vacuum to a ported vacuum (ventouri). Some Ford (dual port) distributors did have both ported and manifold connections. Avoid those things.
Manifold vacuum sources have uses and ported (ventouri)sources have other functions. Use the the correct vacuum source for what is indicated.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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