Can Someone Help Me With Harmonic Balancer and Torque Conveter?

Hey everyone i am currently rebuilding a 351 Ford motor and the guy said that it had sat for more than 3 years before he had got it. I have it torn down to the harmonic balancer. This thing is so rusty that the crankshaft will not even turn and I cant turn the crankshaft to get the torque converter to move so that I can unbolt it. I have got the Main bolt off of the harmonic balancer. My main 2 questions are do I just need to go and get the harmonic balancer tool and try to solve that issue? And the other question is what is the best way to get that crankshaft to move so I can remove the torque converter?