I'll leave the suspension tweaks the MB DOC, he is the resident suspension guru.
As for the 3.6 swap....Impressive gains to say the least. We have another Shop Forum member who is in the process of building something similar. He is taking a 2.6 I6 and taking it out to 3.6 with low compression pistons and turbos. His name/handle is Krahe. You two should really talk... I'd recommend you go with turbos vs a kompressor. It is a bit tougher to do right but the gains are worth it.
Best of luck in your project and let us know how it turns out...Lee