The l26 intake is better, that's the aluminum one. It needs slight modification for the turbo setup, but the l36 needs the same mods to it. Do not use an l26 block though, they can pop pistons easy with boost.

Intrigue98 is also selling an awesome z7/Stattama kit with a s259 turbo with the extended lip. He's a local to me and we have bought and sold tons of parts to each other over the years and would also not hesitate to buy from him. His about the same price as the other z7 kit and his turbo is brand new.

Whatever way you decide to go turbo when you do you will love it! I finally got mine going last week and I can't get the grin off my face lol. I've driven in a gtp w a cartunning kit and 1.9 rockers and its plenty of power, I did the st2 cam because I prefer the power of a cam. From what I've heard from someone who had the st5 and the st4 is that the st4 is a little more streetable but that's always a personal preference. Honestly with e85 you'd be fine with an st2 for power but again it's all personal preference.