Harmonic balancer tightening (crank bolt) engine in car with 4spd manual transmission

The car is your friend.

Manual trans, put it in gear (the highest you have), chock the tires on both sides. Set the parking brake.

Now the crank will have to rotate against all that immovable load which it can not.

Get you FSM out and get the torque specks. They were put in the book for a reason!

Then torque away.

I don't recall the spec but if it's in the 200 or higher range get a 3/4" drive socket and torque wrench. Harbor freight has them reasonably priced and they also have a torque measuring piece that you put between a breaker bar and the socket with a digital display. Worked great on a pinion yoke