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Platypus, you have a HIC on your carb? I thought that was a CA-only. (Little box with three vacuum connectors on the front of the carb, shown near the air cleaner horn in your diagram.)
If you are talking about the purple out lined object, then yes. Actually there are four ports. Plus all three '78 carbs. on Ebay have the HIC installed. I do have a HAC in a box, but obviously are not referring to that? It is way bigger...