i'm no expert... however i was reading another thread, and they had not timed it properly / tuned it. it was even tested with the advance to be comparable to old school mopars ~mid 30's total. the guy's engine eventually blew. someone else claimed that the new hemis only use around 24 degrees advance. beware! do your research before you end up with trouble.

here is the thread:

http://www.cuda-challenger.com/cc/index.php?topic=28465.435
the problem is shown (with pics) around page 30

dont quote me on how to set the timing on the new gens, but please check before you run it. dont trust that your box has a "knock sensor" or something.