5.7 swap questions?
The Variable Cam Timing is the hold up at the moment. But I am confident that someone will over come that issue in the future, though it may be a while.
Basically IMO, the 2009 apears better all around :
better flowing cylinder heads
more compression
full-floating wrist pins
hd oil pump
10.5 compression vs. 9.6
pistons look a bit thicker in the ring land area (though I have not confirmed)
oh and 35 hp increase over 08 down
plus you would use the 6.1 intake and exhaust...
But, there is nothing available at the moment to control 2009 'Eagle' engines in a retro fit to early chassis.
Check out the link above. I have put a lot of info there...