Read the Bosch number on the pump you have and check it a 3-4.5 bar pump.
I recall some re-plumbing is necessary , so check with Harrison how he did the mods.
Check that ground and +ve is on the correct terminals of the pump. Check for suction air leaks, blocked filter. If you look at the spec sheet most pumps have different diameter terminals to avoid mix up. But double check polarity.
If the pump is way out of spec or running in reverse or has leaks it will cavitate and thus be noisy. I believe roller pumps still pump in reverse, just not as well.
I wouldn't race out and buy a new pump until you have explored all of the above. So called professionals aren't nearly as thorough as the owner of a classic car!
Interesting idea, so in reverse the fuel supply and return lines would also have to be reversed?