Weiand water neck???

I have a weiand intake for my 360 and I was getting ready to put it all together and I noticed that the thermostat hole is huge and my water neck don't match up!? And there is no grove for the thermostat to sit in? I've attached some pics so you guys can see what I'm talking about. So do I need a special water neck and thermostat to make this fit?

The hole measures just a touch over 2"

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