I found some good information from Viper Alley .com
From what I have seen and understand, they will bolt on but you will need a gen4 intake and some custom throttle bodies (08 is electronic throttle). You will need to adapt the idle air motor to be used on the intake as well (idle is controlled through the throttle bodies on 08). The injectors have been moved to the heads so you will also need fuel rails. You might also need to change push rods.
and
Greg Good
"They will bolt onto a Gen 2 and Gen 3 block, but then the fun starts. I have a customer that is talking about doing it, but only because of the fact that it will be unique, and he wants something no one else has. It will be a custom one off build.
Buy some Strikers instead!"