I have a 1981 HD wide glide my brother left me when he passed away . i have had it for a year sittin in my garage and i havve finally decided to do something with it.It has a blown head gasket on rear cylinderdo i have to pull the engine to replace it? I am a motor head but never worked on HD. I guess it kind of scares me to tear into it since it was the last thing my brother gave me.