you need to do a little digging into the road runner! the smallest motor for road runners that year was the 340. if it has a power bump hood and the 318 it most likely is a satelite sport and is not worth that kind of money. and road runners never had a vinyl top unless it was a SE with leather seats and a colum shift-and that year road runner had the exhaust cut outs for the exhaust threw the rear valance panel. also check to see if it has a rear sway bar. whats the vin# i can run it and tell you the whole low down on when -were-and how it was built with what options. i have the a 1950 threw 06 chrysler decode book in my hands.