If I were you I'd put the stock 3.8 one on.. You still need a lot of mods to support the 3.4, and it doesn't seem like you have all of them in line.

I'm piecing mine together (3.4 setup) here is what I'm getting to support it:
Headers, Intake, One Degree Colder Plugs, New OEM Wires, Ported s/c, Tune

That's everything that should be needed for a 3.4 setup. If you don't have these, put the stock 3.8 on. Not hating on you, it's for your motors sake.