No stock 70 Dart kits available. You can find resin bodies for about $40 and you will need a Revell 69 Dart kit to finish it off. They have rereleased the 70 Dart Hemi Hunter? but the quarters are cut for big tires and there is a HEMI in the trunk(so I dont think you get a trunk lid with but I am not positive.) That would be hard to scratch build.
I am collecting parts for my 71 Swinger build from various kits and will be documenting the build here. I will probably spring for a resin body but am hoping for a new release from Revell, don't think that will happen but I thought the same thing about all the B-Bodies Revell has put out.