Green top's are type 1 injectors are they not.
I think Katech has a O ring kit to allow you to use type 1 injectors in a manifold designed for a type 3 injectors.
The fuel rails will be a guessing game, if they can be used you'll probably need to fab up new brackets.
Katech may have mount brackets and what not to allow you to use LS1/LS6/FAST rails on a L76 manifold.
__________________ Vehicle: 2005 GTO M6 Quick Silver(409rwhp/401rwtq SAE adjusted)
Appearance: S.A.P. Grill and HP Design Evo 18x8's
Installed: K&N CAI, SLP Pulley, B&M ripper, Voodoo 60511, Patriot 2031's, Comp 13703, Stainless Works LT's, Random Tech Cats, and Stainless Works Dual 3" Cat Back.