Quin, it's funny that you said that because I was thinking the same thing as a wrote it.
I got that number somewhere on the web. It's probably a conversion from grams to lbs. I said "about" since all fuels have different weights.
I think if the ignition were set up improperly, the car would run poorly throughout the power band. When I first set mine up I forgot to hook up the retard line and it completely bogged at WOT. It's worth looking at, though.
My own suspicion is that it is a mismatch of components. B303 cam with 1.7rr rockers stock heads and intake with 70mm TB and 76mm MAF.
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351W 89 Mustang GT Convertible