[SFfiredog]

The correct way is to use a balancer installation tool. You might be able to rent one for a parts store. In a pinch, you can lightly tap the balancer on, after making sure the key-way is lined up, untill you can engage 1/2" of thread on the balancer bolt. Then SLOWLY tighten the bolt to draw the balancer into place. Torque the balancer to 150 ft. lbs.
The 4 pulley bolts are 3/8"X18 (corse) X 3/4" long for a steel pulley and 1" long for an aluminum pulley.