I have been reading about those bolts breaking the body nut. And saw threads about the hole. I bought new ones and plan on heating the old one up and PB blasting the heck out of them before attempting to turn.

Do you think I should head it off and drill an exploratory hole above and spray in some PB? Then all I need is a body plug to seal.

I found a subframe on ebay that states to be rust free and in photos looks ok. We will see when it arrives. From the photo, looks to be miles ahead of what I have now. I wish I would have paid more attention to it over the years to prevent the rust. NJ road salt did it in. The new one will be soaked inside and out in fluid film. My new friend.