I've been following this post for a while. Have to say that the new head better flow 330 and up out of the box or I personally wouldn't bother.
A STOCK Eagle head will flow 310 cfm with a stock valve!
I think the LA plaform is dead unless Fiat cast some blocks. I know Ritter has some blocks but from what i'm hearing they still have some problems.
Dollar for Dollar I believe the 5.7 hemi will product more power at a cheaper price than an R3.
KEEP in mind we are talking 750 and under HP. I'm NOT comparing W8 or W9.
The reason for my statements are the fact that 5.7 Hemi are cheap and plentiful. The heads flow tons and parts are available.

Matt