318 exhaust manifold bolts and nuts....

Hey guys,

I have a couple of questions regarding the installation and hardware of my 318 exhaust manifolds. First, what size and thread bolts do I need to buy to fasten the manifolds to the heads? Second, do I need sealant along with the gaskets in order to properly seal and install the exhaust manifolds or just gaskets? Please let me know how you guys would do this process. Thanks!