If that bike were offered to me for a grand I might think seriously about it. But not until I had spent a couple hours minimum, going over it with everything I have in my toolbox. Same as any other used equipment purchase... if it were for sale dirt cheap I might snoop a little less, or not at all.
Are you a decent mechanic with some decent tools? Like old, durable, heavy, well-built stuff? Don't mind paying premium prices for used (obsolete) parts?
I have an 87 and I really like it. I'll have over 2 grand in it when its done. I'm a nutter though... the incurable kind....
How do you feel about that Foreman? Will it be a good bike for you?