I used the AlterKtion setup in mine. I ordered it without the motor mounts welded in, so I could position the drivetrain where I wanted it. By mounting the engine approximately five inches forward of where a stock small block would mount, I was able to install the NAG1 with NO MODIFICATION to tunnel or crossmember. Of course this was a J body, so it might not work that well in your car. I had to use a rear sump pan, and truck passenger exhaust manifold, but otherwise all of the Charger stuff went in.