It is a good idea to torque it to spec, I know. But, much like the reply to the impact gun, not all of us have the tools needed to get a bolt to 147 ft.lbs. of torque. My biggest torque wrench (got 3 of em) stops at 125 Ft. Lbs., so that's as far as I got.

I work at Mitchell Repair, so I'm surrounded by mechanics. They all told me that a hit with an impact gun on that crank bolt is enough to hold it. That'll set it to around 100 ft.lbs., and the fact that the bolt turns against the rotation of the pulley will set the bolt into place over a few miles.