It ceartainly looks in very good condition for the age, the bike is probably hard to push because the brakes are binding, so the calipers will need stripping and freeing off, if the gas tank is badly oxidised, or rusty as we call it in uk, it will need a good clean out, if it is leaking it might be rusted right through, looks to be a good project if it's not silly money, in the uk that machine with those problems is probably valued at around £1000---£1200 in my opinion. Good luck with it.