I found this GM writeup on prepping the 302 for H-D service. I also posted it in the General forum.
http://www.camaros.org/pdf/Z28_HD_service.pdf
I also found some information on the 2x4 intake.
http://www.camaros.org/pdf/Z28_2x4.pdf
Both are in the library section of the site. http://www.camaros.org/library.shtml
Thanks for posting the links here.