Cool - new parts - will be watching you work with the header piece - needed it in the past and sold the truck before that part came out.
Some light reading for another member who used the same parts and found some challenges using them.
http://67-72chevytrucks.com/vboard/s...d.php?t=655031
Not sure if the parts have changed any since that post is from 2015.
Keep us posted on your progress with the new header pieces.