Having a bigger (mercedes) V8 in the Crossfire would be fun that's for sure, but I just wonder if the performance gain over the SRT6 (if any) would be worth all the trouble? There's no doubt, you can't beat the sound of a healthy V8 thru the right mufflers though.
For what ever it's worth, the shop that built my hood is chomping at the bit to do a Crossfire/HEMI swap. After seeing some of the other "projects" that they have in their shop, I wouldn't hesitate to let them build one for me. (if I could only afford one that is).