I am now offering 8AN fuel rails for the 5.2/5.9 Dodge Magnum engine using the M1 4-bbl EFI intake manifold. It will not fit the OEM barrel intake. If it is used on an M1 2-bbl EFI intake, shorter mounting brackets will be necessary, which I can provide, but I feel the 6AN fuel rail is better suited for that intake.
http://stores.hi-potek.com/fuel-rails-8an/