which exhaust manifold bolts need to be sealed (because they are into the water jackets)?

 

i believe it depends on the casting, some of them have more than one coolant hole, found that out the hard way, haha
i know theres one on the driver side, towards the back, might be the second bolt from the back, or third

 

Welcome!

I believe on a 318 it is the first and last bolts on both sides.