thermostat housing leaks

I had the exact same issue. Chrome Mopar water neck and Eddy intake. After the second try, I ditched the chrome and got a water neck from autozone. I used a gasket and a thin layer of RTV. When I first fired it up (after sitting for 48 hours), it started to leak ever so slightly.
The leak seemed to go away after it warmed up. I'm going to keep an eye on it and replace if needed. Anyone know how the water necks are with the O rings? any better?

The one on the Barracuda is an o-ringed housing from Terry's Auto Lab. I got tired of the leaky cast iron housing, so I spent the $100 for the good one. I'll put one on my Valiant if it shows any signs of leaking.