[Bruce Edwards]

Clois,

I use nothing but FelPro gaskets in the engines I build and you never put any sealer on the gasket type you are using. The surface is coated so that the gasket can move around a bit as the engine heats up and cools down. You should need no other sealer of any kind on the intake to gasket or gasket to head surface. Only a very SMALL drop of sealer in the corners is all you need.
Silicone comes apart with fuel. It is not to be used for the intake side or any area were it can come in contact with fuel. Read the tube guys as well as the instructions that come with the gasket set.
If heads were milled and you milled the top of the block and intake to match the amount you took of the heads the gasket should fit just like it did before you milled it. If it does not something is wrong.
The intake gasket is made to hold in place by sitting on the head gasket tabs. That is why they are there.
Trust me on this. I can not tell you how many "Hotrods" engines I get in from folks that install intakes and then wonder why it runs so bad. After they have played with plugs, wires, carbs and the like they take it to someone that understands how it all works and the first thing to do is check the last thing they did before the problem.
Check the intake, Sealer leaking out the side every were. Pull the intake. Clean all the crap out of the ports and out of the bolt holes were it can give you a false reading on touqe. Put on a fresh gasket the RIGHT way and the problem goes away.