The Hilborn system is little more than a controlled fuel leak that is idealy suited to all out competition engines, but is very hard to set up for street driving & very few ever get it right.

Ddgonzal is right, sourcing one from an existing car is the way to go but why not consider an electronic system.
They have a great deal to offer, not least of which is tunability. This is why the entire motor industry has gone this way, ... tunability for emmisions purposes, for economy, & for all out power.

A mechanical system does not offer the ease & simplicity of the electronic injection & they can be used in so many different configurations.
Fuel only. [like mechanical]
Fuel & spark.
Full everything [like new cars]

Think about it before doing anything.