I,ve moved my rear back in my car(66Dart)Josh you can drill extra holes up or down,back or forward.Just make sure you measure 10X before drilling.Figure where you want your rear to sit(make sure rear hangers AREN,T pushed to far back)this is why I say an extra hole,so you can choose which one you like best for your setup.Your car is different than mine,being a newer model Scamp/Dart.Make sure to measure and measure again before tac welding the boxes in place(You can always cut grind tacs and move an re-tac)Good Luck.:happy7: