Sounds like a belt and suspenders approach to me. Back when I had my 79 Spider, I eliminated the mechanical fuel pump, and mounted an electric back in the trunk. I found some rubber insulating blocks to mount it on, as others have recommended.
So, here was my order of fuel flow:
Gas tank ---> inline fuel filter --->electric pump---> factory metal lines to engine bay--->another inline fuel filter---" carb fuel intake.
Back in the day, Bayless made a really sweet block off plate to use when you remove the mechanical fuel pump.
1983 Pininfarina Azzura
1979 Spider 2000