Dave, all due respect. but the low mileage 1970 GTX would be extremely suspect - wrong plug wires, wrong radiator cap, added electronic ingition.and you can;t see enough in the challenger pic to make a determination. how about a pic of the hose(hoses) from the opposite side.
If you have it , whats the pt number called for on the buildsheet for the upper hose. My parts book calls for 2863257 (used from 1969 thru 1971 on B+ E bodies with max cooling OR with A/C ) .which is shaped nothing like what you have shown.
