Those heads can be made to hold 18 psi of boost.
Here are some ideas that you may consider:
O-Ring the block (see pic 5 in this post)
http://www.camaro5.com/forums/showpo...4&postcount=13
Use "good" head gaskets and aircraft goop. This works well but in this case was used in conjunction with o-ringing the block.
http://www.camaro5.com/forums/showpo...5&postcount=93
P.S. You meant 3,900 pounds, correct ? Or maybe it is not a 2010, but some earlier/other body style.