4l60e transplants?
The 2004r is a good option for guys who want an overdrive without much surgery. Even though one can be built to easily handle that kind of power, the big problem is how to handle the transmission TV cable. I ran into this problem when researching a 6.1 hemi transplant in my car and it was one of the major reasons I scrapped that idea.
Even with tunnel surgury, imo the 4l60e is a better choice but it will have to be built pretty well to reliably handle that kid of torque. Also, I'm not sure of the cost on the bellhousing, but another option is a Wilcap adapter plate. They're who I used when I mated a 2004r behind my 360 and I was very pleased with the quality of the product.