Iron cast manifolds are repairable. In Burnaby, there's a place that fixed a cracked manifold for me. He didn't tell me specifics, all he said was they'll carve out the cracked area and fill it up with cast iron. Cost me about $50 for the work... or was it $150? They do engine rebuilds, repairs almost everything.do you actually have broken stud(s) or is only the manifold cracked? I know from painful experience that removing broken studs can be <sarcasm> entertaining <\sarcasm> and the added labor would almost certainly increase your cost. Also, if you only intend to change the manifold can you get one from a junkyard in your area for cheap?