That Holley kit you reference has an electric in-line fuel pump included right in the kit. I'm reasonably sure that using their included pump is pretty much a requirement for the system to work, but I've never worked with installing an aftermarket EFI kit firsthand.

You will need to add a return line since your car doesn't have one.

If Holley is featuring your car in an ad campaign, I will assume they will provide you with some tech assistance to make certain it works properly? If I were you I'd be taking every advantage of Holley's resources to get your car to run right with their system.

Let us know how it goes! I'm always been intrigued by these types of systems, have never known anyone who installed one.