70 Nova in my next door neighbors garage

[69rsss350]

This is for you Nova guys...
It is a 70 Nova with a 250 6 cyl. Auto on the column. Gold car black vinyl top and black vinyl bench seat interior. Now I haven't been able to get under this car's hood or trunk or even inside it (crap piled three feet high on top of it everywhere). It was his mom's car who bought it when it was two to three years old. Hasn't been registered since 97. I can tell you this, the car is ALL there. Top even still looks good (as good as it can with a half inch of dust on it. There is only a slight show of surface rust behind the front wheel well. Keep in mind that we don't have a rust problem in New Mexico. Interior looks good thru the window. Car has approx 85 K original miles. If this car is as solid as I believe it to be, what is it worth? Is it worth more to redo the all original drive train or to build it with a V8? Thanks in advance. I want to make the guy an offer.