The only mods I had to do to the car was to take out the hump of the crossmember starting at the trans mount crossmember and running over the top of the trans to the other side.
I have some pretty heavy duty subframe connectors welded right next to the where the tunnel hump section came out, so between that and building a new crossmember for the trans mount that's all I had to change on the car. (well, also shorten the driveline)