The drive belts has to be off of the harmonic balancer, so they need to be removed. The Harmonic balancer to Crankshaft bolt must be removed, and if the crankshaft is broken, the Harmonic balancer will fall forward into your hand.
As of the project, still putting the engine back together with the limited time. The crankshaft was finally cleaned and the ball bearing installed. The ball bearings had to be frozen in the freezer before they will go in easily. The main and rod bearings measure between 0.0015" to 0.002", the spec is 0.0011" to 0.0022".