Nice saw! I ended up with my C-72 in a similar manner. My neighbor asked me to cut down his hackberry (28inch) as it was dying and leaving a mess on " his precious grass". After that task he brought out the old homey and said if I made it run I could have it. I asked how long it had been in storage, he said 15 years. There was still fuel, well varnish, in the tank. What a mess. After a good flushing,new fuel line, and a tilitson carb kit, oh yes and profanity it has become one of my favorite toys.
sorry for the play by play!