Ok, you have an elelctrical pump probably for an EFI motor, not the stock original motor which would have been mechanical and mounted to the drivers side of the engine as PrintDad described.
I have found most all electric fuel pumps vibrate or whirr, etc. it is more evident on add on fuel pumps that weren't mounted originally like yours. You may be able to isolate the mounting surface with some rubber pads, etc. just make sure you use a grounding wire so it works. You may want to start a new thread titled 'how to quiet a loud electric fuel pump' or similar. You'll get more answers from guys running EFI that have dealt with this.
'67 Coupe 289 stroked to 333, AOD, 9" w/3.50:1, PDB, Candyapple red w/red deluxe int., PS, ext. decor group, light group, foxbody seats.
'09 Black Warriors In Pink with glass roof - the wifes Mustang.
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