sorry I mis under stood, ok get a propane torch ( a small one) and some run of the mill candle wax, heat up the bolts that still have the heads on them so they are really hot but not glowing red then remove the torch and touch the wax so it will drip behind the manifold on the bolts, let it cool a bit and then try to wrench them out with what ever fits them the best. As for the broken ones this will suck, after you get all the bolts with heads on them out, you have to take off your manifold (which is not fun) and then remove the broke ones with the stud remover or vise grips I recomend vise grips, unless you plan on taking any other studs out then the stud remover is a good investment. But wax the broken bolts too after you get the manifold off it makes them come out a bit nicer. be easy with the torch aluminum likes to warp but I dont think it should hurt your head because the head is bolted down.
