This is an interesting idea that I stumbled upon whilst high on marijuana cigarettes, and it actually worked.
So my fuel pump went out on my 1999 mustang
GT 5 speed. I decided a while ago that EFI was lame and I was going to go old school edelbrock as soon as I had a good excuse, but I didn't know if I could use a distributor on my 4.6.
Then I decided what I would do:
-Keep the ECU, fuel rails, injectors, coils, and intake the way it is.
-Make an adapter plate to put my Edelbrock 650 on the stock intake
-Plug my gravity feed fuel pump bottom of my gas tank
-Turn the EFI fuel pump off at the gravity switch located behind the carpet by your drivers side tail light.
-Turn the key, and enjoy the throttle response.
Long story short, it worked. The only thing I have left to do is connect the TPS somehow but im sure it wont be too complex. The car starts first crank even though its 5 degrees here!
I highly recommend edelbrock. Mine is easy to use and is less touchy than Holley's carbs are.