The 600 is going in a woods tractor. The dynamark steering is shot, and the engine is in it but the pulley won't come off. So i can't get the engine out because some reason the hole for the motor is smaller then the pulley?
Steering isn't real critical on a woods tractor, just ask Chris! This would afford you an excellent opportunity to practice front end design and fabrication, where all the evils of front end geometry aren't going to kick you in the seat of the pants quite so bad if you don't get them perfect.
Hole smaller than the pulley was pretty common back in the day when engineers thought that engines were gonna last forever, and you'd never need to take that pulley off. Later realizing it didn't and you occasionally did, they made the hole bigger! One of these days they'll figure out you need to get the pulley off the shaft to get the pan off and use split sheeve pulleys so that things would be less apt to grow to the crankshaft permanently too! Maybe! Honestly I think it's a secret plot to overthrow the world one stuck pulley at a time, by forcing you to buy new lawn mowers when all you need is a pulley that comes off.
Hacksaws, side grinders, and air chisels come to mind! Cut a section of the pulley out on one side, grind down in the hub a ways stopping shy of the crank, might want to hacksaw the last little bit to be on the safe side, and use the air chisel to split the hub and rattle it off.