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The items Rob mentioned, debris in the tank, plugged in tank filter sock,
etc. are all possible causes for the fuel starvation. The fuel
demand is much greater when going up a steep hill and it sounds like fuel
starvation.
Two other things to consider: (I assume it has the big block
engine.) The push rod that operates the fuel pump may be worn, making even
the new fuel pump marginal when the fuel demand is high. This would
account for hard starting after the stalling because the carburetor is dry and
you are trying to fill it with a marginal pump. This can take a long
time. Maybe longer than the battery will last. You can replace this
by removing the fuel pump and the pipe plug just below the fuel pump
opening. Work the rod out by reaching inside the fuel pump opening with a
needle nose pliers or similar tool. Compare the length to a new one.
A second possibility is a small hole in the fuel line from the tank to the
pump. This would allow the pump to draw air in with the fuel. It may be OK
under road load but with a high fuel demand you get more air and less fuel
causing the starvation. You should be able to trace the fuel line from the
tank to the pump and observe a damp or dripping line after the car is shut off
if this is the case.
Good luck.
Rolland
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