I have gotten the engine(305) tore all the way down to just the block and heads on the engine stand. I have all the bolts that i can find and i promise you that i have fished around in the sludge to find any more. I also have all of the push rods out and properly secured. I can not seem to get the right passenger side head to budge at all. Ihave taken a steel pipe coated with rubber and hit it with a hammer and nothing? Are there any secrets that someone could tell me? Is this a common thing to happen to old engines? Is it safe to try and pry them off? I haven't tried the other side yet so I do not know if I will run into the same problem or not. I did a lot in one day and decided to call it quits' after the heads would not come off.