Ive done quite a few long rears on cars and If i was looking to buy that particular car to repair it i wouldnt be prepared to pay more than 50k for it.....not to sure on what a long rear would be worth with rear suspension ect in it but if had to telly up my labour figure for stripping/unpicking the joins rewelding it,repaint and assemble and id say around 20k.....a long rear is most definatly the best/safest and most unnoticible repair for that car.....