273 coolant drip right exhaust bolt hole

The factory put studs in the head for the front and back exhaust manifold attaching points. Also, I believe all four of those location (two per head) are into the coolant jacket. You can use studs or bolts (your choice and depending on how original you are staying with the build) but you will need to put thread sealant of some type on the four bolts/studs in those locations.