not sure if 70 has crash bars in the doors, if so cut them out, i even lightened the inner window regulator and bars in the door, remove all under coating along with the above ideas, brakes too

6342240-brakes.jpg (124 downloads)
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105