I know I have to put sealant on the bolts but not sure which ones to put it on and I would like to know which ones.

all, and then you don't have to 2nd guess yourself

I use thread sealer on them all, cant hurt

Do yourself a favor and use good old, Permatex, "Indianhead Shellac Gasket Cement", it was made for this!!

A daub on the threads and a little daub under each bolt's hex-head!!

Messy to say the least, BUT works great by me!!

pdq67

Ditto
All of them go in to water, all of them need sealer. Same deal with the intake bolts. Some go into water, some fo into oil, seal them all then you don't have to worry about it