Lets take a few steps back here and let me ask something that may have been answered in this string already.
Was the car ok before whatever happened to the fuel pump made you have to replace it?
I think you have something else going on that's not fuel supply related because if the motor at part throttle was not getting enough fuel to go up a slight grade it would be popping back thru the Carb, which is something you have not reported.
Keep in mind that in testing your ignition system voltage that meters only take very very small amount of current to make a reading.
It's quite possible to read good voltage where you should, but a poor connection may not be providing enough current to run the HEI system as needed.
If it where me I would be at the point of testing for proper spark output as described in post number 18.
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