A few Top end rebuild questions

I have replaced just about everything from 24 studs to rings... I am now ready to finish off and have a few silly questions?

1. Should I use any gasket type sealant on the cylinders, the head to cylinder surface, the case to cylinder surface ?

2. What about the O-rings, Oil Thremostat, Chain housing cam O-ring, should I use anything there?

3. Other gaskets such as Chain housing, case breather stack, should I use gasket sealant there?

4. What about the Cam housing that goes over the heads, should I use a sealant there?

That's about all

Thanks...

1. No, you should have a copper gasket or gaskets on the bottom to set your deck height and some kind of gasket on the top depending on year.

2. yes, silicone grease.

3. No.

4. Yes.

Bruce