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I shouldn't even mention it cause someones gonna But the most effective sealant I've used for the ports on a Mopar BB intake is Hondabond 4 from your local Honda Motorcycle dealer... I use it on both sides of the bathtub around the ports... I use a dab of silicone on the four corners where the head/block & bathtub meet...

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Hondabond is great stuff. I also think the "right stuff" you can get at Napa is very similar. You could also use it on the corners too. Hondabond HT vs Hondabond 4 is a little easier to work with because it is thicker like RTV. Resists gas, oil, whatever.........Jim