Way back when I was contemplating swapping my 2.6T motor into my gen1 2dr, I called Mitsu cusomer service and sweet talked my way to the engineering department, who transferred me to the Aisin Warner tech dept and I found an engineer who spoke English, and understood Southern (which he thought was funny, and put me on the speaker phone for the other Anglophones to hear), and the most he felt comfortable with was the metric equivalent of 300ft lbs of torque. I think an LS1 would smoke an AW372 mitsu trans. A 700r4/4L60E would work just fine, and adapt to a NV242 tcase for a center diff and be equivalent to a gen2 selectrac