TTI/Eddy Sealing Problems?

I run TTI's on my 69 Dart with Eddy heads and have zero leak and they have been on there for 2 years. I cant remember which gaskets I used but they are blue in color, could be the 1213 Felpro. I also have used the green color gaskets with no problems either, I think those are Mr.Gasket. Same thing when I had the stock iron heads-no problems. Greg