Looked at the FSM for the 70's. It shows some specifications, but it does not show outside to outside of frame rails.
If you happen to have measured the ID to ID/OD to OD of rear frame rail, and front what are the measurements?
Also the 70 Cuda FSM is much clearer and well organized, to include referencing exactly what points to measure from. Any chance I could use those specs on a Challenger, or are they different?