I also think it is a myth that an EFI pump must be "lower than the tank and very close to it". People say a Walbro pump can suck fuel up to 5 ft high. For years I have run Holley Pro-jection TBI on my 1965 Newport. I had many problems trying to follow Holley's advice w/ pump at rear. I finally installed it in the engine bay on the lower frame rail. In a test, the fuel just poured out of the 5/16" tube into a bucket under gravity, maybe 0.5 gpm, so I couldn't imagine that would starve the pump and it was never a problem. I just switched the fuel tank in that car and went to a 3/8" supply, so even less concern.
BTW, the Pro-jection system has always been finicky. It was a poor design, by not having a MAP sensor, just throttle position. They finally fixed that in the final-gasp version (4Di), which became the Commander 950. It was originally designed for Holley by the engineer who runs Big Stuff (professional racer EFI) and the early "by MSD" sytems appear the most reliable (rugged connectors, ...). Holley seems weak in engineering, especially electronics, at least at that time.