i would have to agree with jgprelude. the radiator was fine before and then they f***ed it up. then they do a ****ty fix job and let you screw up your motor. i would have the complete motor checked, include anything you can, even compresion test. make sure everything is close to proper running order(i dont know what year or miles you have on it, so it will have some wear).but you should get everything fixed by someone else, make sure they pay for it, dont let them come within 20 feet off it, try to get something for all your b.s. trouble, and be ready to kill someone for messing up your baby. thats just bad buisness to let a crappy tech. work on someones car and screw it up that bad.
its like,
Billy: oh crap Earl i just drilled into the oilpan on accedent.
Earl: oh just patch it up with some bondo and hope he dont notice.
thats not right. f*** those D***s

, if you have to take them to court, geting head gaskets done arent cheap
P.S. you would put a thicker head gasket on there if you wanted to put a turbo on it, just something to think about.
Hope everything works out for you