this is for a 2.25.. ive heard a leak for some time and found its where the pipe bolts to the bottom of the manifold. looks like one of the studs went to far in the manifold and cracked it. the rest of the system in faily new. im worried about breaking off 46 year old bolts and stripping nuts. what should i be careful of and look out for???, and tips would be helpful, thanks, nathan