I don't post much but! I have two Lincoln continental 68 and 69. These car are very well built compared to the muscle cars. Yet there value will never reach that of the muscle cars! As far as the Reatta's, they might be under powered and all that, but there time has not come yet! If nothing else, there lack of numbers will be what will bring up their value!
Impact wrench and you have to vibrate it loose will take some time. But it will loosen up.