Anyone Swap LS1 into a 3rd gen using aftermarket K-member???

I was wondering if anyone has used an aftermarket K-member in the LS1 swap. Im going to be using a "Hawksthirdgen" K-member and Im also using the stock spring set up...to get to the point..has anyone used this set up and had success with headers other than custom fits??? Or if anyone has any additional suggestions on where or who to purchase a set from for reasonable pricing that would be awsome! Thanks

fbodymotorsports should have most of the stuff you need:
http://www.fbodymotorsports.com/ls1_conversion_parts