Wow, that's a strong offer. I'm glad I didn't bother giving my guestimate. Even with the low mileage it looks like it would need a complete teardown to do a proper restoration and reassembly. That could cost an easy $30-50K. They might not have the resources to get the restoration done and that's probably why it's for sale. It's a shame to see an original owner car like that get sold though. But somebody will bring it back to its former glory and we want to see it when it's done!
