75 rr or 73 sport?

Well both are pretty cool cars I think. From a cost and parts availability stand point, the Sport would be cheaper and easier to build. Probably the hardest part with building the Road Runner would be the Road Runner specific parts for that year. Most of the suspension/drive train parts are the same as 73/74 Road Runners and Satellite 2 doors. Im not 100% sure but I think the floor pans are similar also. The cool thing the Road Runner has going for it a few other memebers pointed out. It is a stick which is kind of rare and its the last year for the RM vin. Another point to think about with these 2 cars, you will see far more 73 Dart Sports than 75 Road Runners. As for value if you ever sold them, like anything eles you will only get what someone is willing to pay. JMO