For what it's worth, Pace Performance has 'em for $6119.95.
http://paceperformance.com/i-7141040...iv-engine.html
Save you a couple hundred over Crateenginedepot.com.
That said, be sure to check the costs on shipping. There are many folks out there that jack up the shipping price so they can list a lower price.
I have not yet ordered from Pace.
One person who I have ordered many parts from and have always had great service at a great price is Jeff Tate at Days Chevrolet. I would run the question by him -- you already know the ball park price. See what he has to say.
jtate at dayschevrolet dot com.
No, I don't have any association with him (other than him selling me parts).