Have been considering rubber mount between fuel pump bracket and engine compartment panel.
Haven't found quieter pump (Carter).
People who have pump in trunk says noise still there, just behind you now.
Have louder muffler.
Drive faster than I probably should.
Will go with pads next.
Using later E21 fuel pump underbody is $$ option.
Go back to original mechanical pump. Upgraded when went to 2bbl Weber as suggested. Not sure it needs it.