I think I side with Bartamos, on this one. Both trucks for 4 maybe... but the inner panel rust of the cab looks like a pain to work with. And how bad is the bondo under the paint? Just cause you can't see it doesn't mean it's not there hiding more unpleasantries.
I'd be sure about the rest as far as rust goes and offer 1/2 of what he's asking. You're not buying 'what could be' but What Is.
No running motor makes it a boat anchor till proven different in my book.
All that said you don't see many 58's up for sale compared to other years for some reason. Were they all chopped into 350/350 hot rods or something?