Stuck 440, Need Help !!!

Hello guys. I just bought a 1970 440 with plans of rebuilding and installing it in my 71 demon. The 440 is stuck. I have taken the heads off, removed the valley pan and lifters/push rods and have been lubricating everything w wd40. I have been using a large breaker bar and have not been able to get the engine to budge. Does anyone have any other ideas on how to get it loose? Also how bad can the cylinder walls be rusted and the engine still be rebuildable?? Thanks in advance for any help.