I am rebuilding a 65 Chevy C10 and am putting a GM Crate Motor 350 HO in it.  I am having problems finding out which header will work.  I would like to go with a Hedman but can't figure out which one to go with.  Does anybody know which one will work with no clearance problems?  The Crate Motor comes with Vortex Heads and they were first put on 1996 5.7L engines.  The Tranny is a 700R4.  In case you are wondering.  A part number would really be helpful since I live in Alaska and shipping up here is a pain and don't really want to be shipping headers back and forth at +3 days at a time. Thanks.