Hey Hammerdwn,
Sorry I didn't see this before. If you haven't gotten it yet I'll try to give you some help. I'm not an Insley expert, but I've been wrenching on some old friction rigs the past few years. The old Chrysler industrial engines were common units in old cable shovels and cranes so you should be able to find whatever you need to get it running. Start spraying any mechanical linkages and joints you can find with the penetrant of your choice for a couple weeks. Try to get everything connected to the clutch levers moving, and beware of letting off the brake pedals unless the engine is on and you can stop whatever is falling or being let off. Be gentle working everything loose until it's loose, don't want to break something that's hard to fix or find parts for.
I don't think Insley built large cable rigs so I'd warrant a guess whatever it is is under 60k lbs. In reality, a reasonable offer is scrap value-maybe a little more if it's in real good shape. If you need parts your best bet is Gerhart Machinery in Lititz, PA. They specialize in old cranes and antique trucks and equipment. They're good folks to deal with and welcome visitors to their yard.
Hope this helps. Let us know what happens!