You may want to visit semtex's DIY Header Install thread:
DIY: Stillen header installation
About halfway down the page the photos semtex posted are identical to the issue I had....it looked to be off by few inches. There is a solution to the issue in his thread.
The solution that Altered Atmosphere did and I agreed on, was to cut about 1 to 2 inches off my Berk HFC's. So far I've not seen or smelled any problems. I was back at Altered last Friday and they put the car on the lift and said they didn't see any leaks or any problems where they had welded things together.
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