rebuilding Rb26

hi i am new my name is josh. I am here because i am goin to buy a gtr with one blown cylinder the rings needs to be replaced and i was wondering were can i get a set of rings? and i have another question how much is a skyline gtr with a blown cylinder and some rust spots around the fenders and a missing marker light worth? How much would u guys give for one

4000

any one else. or can any one tell of a good forum that will