Edelbrock 7577 question

In short, how is everyone hooking up the heater hose? I have two, 1/8 pipe thread holes, and one 3/8 hole, but it is under the accessory bracket. I could drill out one of the 1/8 holes and tap for the heater hose, but would like to used it for a fan sensor. The other 1/8 hole would be for the temp sensor.
Below is a picture .....
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