Just to clarify why the pumps in the trunk..
(Hal..it wasn't complex...on the contrary, it was crude and primative.
)
The original Comp cars were racers.. they had a 42 gallon tank with no fuel gauge. The tank had two pickups near the bottom, with one about an inch over the other.
The upper (main) pickup ran forward to the mechanical fuel pump on the engine block.
The lower (reserve) pickup ran into the trunk, thru 2 electric pumps in parallel, then forward to a t-connector at the output of the mechanical pump.
The car was run with the electrics off. Simply stated, when the car sputtered as it ran out of gas, the racer would switch on the electrics for a few more minutes of gas, to get to the pits.
Since the S/C's were converted Comp cars, the pumps remained in them as well, with no fuel gauge.