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I have a reg. 1973 429-4bbl with a 1 " spacer under the carb that has a vaccuum switch (?) on the rear with a hose barb. I can't remember which hose connects to this-PCV maybe? Thanks
 

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I would guess ... with no other info ... the PCV would be correct. PCV has to hook somewhere and that is a usual place.

If you have the PCV hooked someplace else and don't need that port I'd plug it and go.
 
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