Easiest way, with less opportunity to damage or screwing up something, might be to pull the transmission first.
Remove carbs from the engine. Remove mufflers. Block up engine and remove motor mount bolts. The exhaust headers are handy 'handles' for you and a helper to lift out the engine.
Several layers of masking tape on the frame will prevent nicks n' scratches; even if you do plan to rehab the frame.
Of course, tank, all fuel lines and electrical leads are already detached, right?
It's not that the engine is terribly heavy, just an awkward lump to risk handling by yourself.