1997 Buick Park Avenue Question: Due to internal coolant leak, do my car nead new head gaskets or intake manifold

My car started smoking from under the hood and started over heat a little. It didn't get all the way to the red part because I turned it off. Before I turned it off, I heard bubbles sounding like they came from under the hood somewhere. I checked my coolant and nothing was in there. I haven't drove the car since. My mechanic said that my head gasket is cracked and I will have to pay $1000 to get it fixed. I didn't have any smoke coming out of the tail pipe and it only overheated once. Is this my intake manifold or head gasket? I don't want him to try and cheat me