Roof cracks

first off its not lead... for whatever reason the mid 70's cars seem to have went to filler vs lead, my 73 swinger is the same way...

best repair is to grind it all out, clean the metal (BUT DONT SAND BLAST), weld it up a bit and then lead it. the tinning process does not work over blasting surface for what ever reason.

also the subframe connectors will help as stated.