Michael, welcome. Best place on the net. This is a build thread, you'd be much better served here-
The main board
http://67-72chevytrucks.com/vboard/f...play.php?f=115
The main Blazer and Jimmy board
http://67-72chevytrucks.com/vboard/f...splay.php?f=36
Good luck, hope you get back OK and enjoy your Blazer!