u got any photos of the snapped off stud
as for taking off the head then u might as well do some work on it whilst it is off cos u will need a decent head kit for this engine and that will set u back a ton
i.e arp head bolts, polished and ported head, cams
also u have to be careful about skimming the head as it will increase compression and u dont want that 🙂
u can get drill bits that will drill into the stud and at the same time pull it out