[Already Gone]

I've seen an 87 Caprice Wagon sitting beside a house for the last year or so. I finally went over the other day and knocked on the door to see what was what with it. I thought it should have the 700R trans and I'd like to put one in my truck. As its turns out the guys sister in law fried the motor in it a few years back and he'd love to get rid it off his driveway. I have 2 questions.. By driving a car till the motor seizes from overheating does that damage the trans in any way? I think not but am not sure.. If I buy this car and want to yank the trans do I need to take anything off the car besides the trans & torque converter to make it work in my truck.. I do realize that this trans will need a rebuild with serious parts so my 396/350HP wont fry it when walk on it.