Originally Posted by Chip

Turning over isnt a bad suggestion IMHO, not like its going to start with no manifolds etc on anyway, so wont do any harm (assuming its a cam in block engine which it must be at that age?)

Head probably weights so much that it could seem like its not wanting to budge when you try and move it even if there isnt much resistance.

Lifting eyes on the head were a good suggestion too, and once the strain is taken so that the bottom end is a cm off the ground (ie its taking all the weight on the head lifting eyes but doesnt have far to fall) then beat the bottom end with a sledge hammer to see if the vibrations will help shift it.