being column shift.....shouldn't matter.....the steering shaft is the same whether floor or column shift.
driver side header fits fine......passenger side needs modification. most gbody guys will dent the interfering tube with a hammer. it looked like I would need to flatten the tube too much, so I partially cut all 4 primary tubes after the flange then bent the collector towards the frame and welded the primaries. I don't have pics of my setup....but this link shows someone who used a similar method.
http://ls1tech.com/forums/conversions-hybrids/1452744-ls1-my-79-a.html