lude motors?

My neighboor has an old 2door lude im guessing bout a 86 - 90 depending on if its a 5 speed or not the motor runs I havent seen it (the motor) so I don't know if its valuable but I guess what I'm asking is what series lude motors are good? should I try and get it, just too sell?

I will find out tomorrow what series it is and post it...