The few times I have removed my crank pulley ony my 3vz-fe I have done it this way:
1) Take a 1/2" drive wratchet and the 19mm socket that goes on the pulley bolt.
2) Put it on the pulley.
3) Put an extension <cough> pipe <cough> on the wratchet and wedge it on the ground so it sits there.
4) Pull the ignitor to distributor wire off so there is no spark.
5) Hit the starter for a half second.
The bolt is now un-frozen, and can be remeoved by hand.
A 200-220lb-ft bolt (They are self tightening, trust me they don't stay at 181lb-ft!!!) is nothing for an electric starter!






A bunch of people do it this way. That's becuase it works so well LoL!

 

As a test, I would like to see you torque a crankshaft bolt to 375 ft/lbs(assuming the bolts doesn't snap in two in the process) and then drive the truck for 5 years and try to come back and take off that crank bolt with your 400 ft/lb rated gun. I'm not sure what happens, but I know that gun or one rated to 650 ft/lbs would be able to take it off. These things just seem to weld themselves in. Maybe it's rust and/or thermal cycles.