Can start with the windshield mouldings here on ebay: 253858584927 these are like 250.
Then there are brand new 74 Dart front wheel opening mouldings that should be real close to your 70, ebay: 152974026621, and 152974027407.
These are a good deal at 106.00 for the pair, free ship too. shipped in undamaged . . well packaged.
Just shipped in a pair of these to rework as rear quarter mouldings for a 67 Coronet R/T, that are super expensive and impossible to find. Sometimes you have got to make your own parts, lol . .
Careful, Careful, think I am going to cut that rear quarter radius into a sheet of 3/4 plywood next to help shape and rework the left and right mouldings without kinking them. Can screw them into the edge of the plywood to hold them as I am working them around. Pulling that tight radius around the corner of that gallon paint can, surprisingly that bends pretty easy. Easy to go too far. Like I say: Careful, Careful , , ,
So yeah, keep looking online for the parts you need. "Google Searches" with the Key search words of the parts you are looking for, can head you into the right direction to find things.