Power loss my 396

My 1969 396 seems to have lost some of its power... The engine only has about 2,500 miles on it and I'm running a Holley 750. It seems to have been losing power since I first bought it, which was about 1 year ago. The carburator looks very old, but seems to be in good shampe... What could account for this loss in power? Right now it has hardly any power in the top-end, and the low-end power is going down as well... Should I assume it is the carberator? And what are the most common reasons of power-loss in a new motor?? Thanks guys!!!

Oh, just out of curiousity I have an electric fuel pump mounted on the left inner wheel-well. I was told I should move it closer to the gas tank. Would that significantly add power, if any at all?