Wayne,
I feel your pain, but we can't save them all. Sounds like you could go thru the list of "common issues" over at the NetReg site and get this car back to being it's old self. Injectors for sure, and then proly multiple vac leaks from old dried out stuff?
Sounds like a hard case though, I'd offer 20 tops & walk away. The car would have to be cosmetically 100% though, otherwise it's less. JMHO

Tom