I finally got back to this project today. Ended up taking the motor out of the tractor, buying an 8" puller at Tractor Supply and going at it. Still wouldn't budge. Heated the pulley. No go. Since the pulley was already bent I said screw it and started tapping downward with a 5 lbs. hammer. Little by little it slid off the shaft. Once it was off I wondered why the puller was still holding on. Dismantled the puller and lo and behold, there were still 4 more washers inside the pulley tube!!!
That made a total of 6 washers and a locking washer inside the stack pulley. CRAP!!!!
Well, all is good now. Another stack pulley is on, motor back on the tractor and it runs like it should. This all done by sundown. Going to mount the deck in the morning and test it out.