Which part is broken are you saying its the cam cap or actually in the cylinder head? Also how is it broken and where? If its the cap then there is a possibility you can source another but you will need to then have it line bored at a machine shop to make sure it's true, but by the time you do all this it may end up cheaper to just source another cylinder head that is in better shape. Don't forget that it won't just be the line bore expense but also a skim, pressure test and while your at it have the valves checked, guides and cam clearance also checked and adjusted add required. I hope when you say its cheap its $200 cheap because it can add up quickly if you want it to be right. My advice find a cylinder head that has low kms and start with that, or if you can afford it new is best. Hope this helps you