Who has advanced their timing?

most people have done it here. some peopel can get away with only 2* of timing or you can be like me and have 18* with no pinging. general area you want to be is about 14* tho. any higher and its kinda a waste. be prepared to use a higher octane possibly
 
I have a book by Richard Holdener and he ran thousands of dyno tests on the 5.0L from very stock to very wild.

I think it netted close, but under 10rwhp. But it's free, so if you can get to 14* w/o pinging then leave it there.

It's funny how much icing the intake manifold helps as well!
Scott