I just went to change the thermostat in my 84 z28 and for starters there wasent even a thermostat in it! and then one of the water neck bolts was broke off in the intake manifold! what should i do??

 

I would drain as much antifreeze as possible, I put 3/8 nuts over the broken bolt and weld them to the broken bolt through the center. then slowly work the bolt back and forth until it comes out. It normally takes 1 to 10 nuts before it is done. Be very careful antifreeze is flammable. You could also try to drill the center and use an easy out on it