Would be able to recommend someone who makes fuel rails for the L67 engine? I found a pile of LS1 billet rails.

We don't unfortunately. YT make a set, otherwise, you can make your own from a set of VS ecotec billet fuel rails as shown in the link below: http://esprit.gatewaybbs.com.au/~vrtidy/modifying_the_vs_ecotec_v6_fuel.htm