If you are building a Late Model GM 4.2L Engine or have a High Mileage Engine...THIS is a Damned Good Deal for the $$$ on a complete Delphi Fuel Rail with Delphi EFIs:
https://www.amazon.com/dp/B072BZGRNW/?tag=gmtnation-20
https://www.amazon.com/dp/B072BZGRNW/?tag=gmtnation-20