97 3.4 crank sensor bad

I am considering purchasing a 1997 Monte Z34 with a 3.4.. The person says he had been driving it, then went out one day and had "no start" had it diagnosed to be a bad crank sensor.. Now, it's over 170 miles away from me, so towing is out of the option.. Is the crank sensor easy to replace? Where is it? Anything else I should know about replacing it?