Whats it worth? Sorry

I would pay $2,000 to $2,500 max. If those leaves in the cowl have worked their way down into the fresh air box you're going to have some corrosion to get rid of in a very, very difficult place. It's almost impossible to get into the fresh air box without cutting a good sized hole somewhere. That said, if you can get it real cheap (less than $1500) and the body is in good shape and it runs OK you come out alright!!

Treblig

I would like to revise my estimate now that I know that you plan to flip it...makes a big difference!! $500-$600 if it runs and drives good if the body isn't all jacked up.
The cheaper the better when you flip something because you NEVER know what you're going to run into.
Treblig