Holley Sniper Stealth system

1970 Dart 318 with 904 transmission.

We are starting to plan out our (father son) installation of this Holley EFI system and we are having some difficulties finding answers to a couple of questions we had. Have any members installed one of these systems; specifically the Sniper Stealth 4150? If so anything we should be looking out for? There is a lot of info on the Sniper systems and videos but this Stealth system is a little different.
Questions:
  1. Where does the fuel return line...

Holley Sniper Stealth system
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