The gas wrench (torch) is the easiest and quickest way to remove anything like this because the heat will break down the oxidation along with shrinking when it cools. 40+ years working in maintenance, on cars, and road service on equipment, and I have found nothing better than heat to remove rusted parts. Hitting the part with a hammer to shock it would be second on my list to get stubborn parts to move. Striking a part will actually get the threads to straighten themselves out and conform to the other half of the threaded parts along with breaking the bond of corrosion.
Anyone that is going to be seriously involved in the car hobby should invest in an oxy/ acetylene torch set, it will make your work much easier and save you time and money in the long run.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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