Hi guys, relatively new here. I usually post on the big bolts section, but have a general engine question. I have a BB Chevy in my 1 1/2 ton. It was previously installed by the former owner. He said it ran several years ago before being parked. I am at the point of getting it running now. I pulled the pullies off the front of the motor and put a wrench on the balancer bolt, tried turning clockwise and it won't budge. I pulled the plugs and noted there was some rust on the very bottom end of them. So I am assuming the motor is frozen due to the rust in the cylinders. What is the best thing to do to free it up?