Will a 350 Chevy fit into a 1972 dodge dart

Truthfully it will probably cost more to modify the SBC to work/fit in a MOPAR and unfortunately all the money you spend will be wasted. No MOPAR guy would touch it and no Chevy guy would buy it either. This swap will be a headache and a total waste of money. Taking out an engine and replacing it with the like engine can be a pain in the rear and you generally run into little problems. A SBC swapped into a MOPAR will be a MAJOR headache and I'm very sure that no one makes a swap kit because this is hardly ever done, if at all.