I need some advice on what aftermarket fuel rails work and don't work .what clears the back of the alternator.
the truck is an 2002 gmc that will have dual 450s in the tank .thanks in advance

 

I run billet ls1 rails from summit. Made brackets from angled aluminum. Cut the mounts off for the factory rails. Then mounted the brackets to the intake. Rails to the brackets. Used the bolt spacing on the rails to tell me where to mount the brackets to the intake.

Braided line for the fuel crossover underneath the TB.