Here is a post I made about my Suburban several years back -
http://www.67-72chevytrucks.com/vboa...d.php?t=722578 - Post number 4 and 6 in the thread.
Even though the body was straight, rust was really taking over. Especially above the windshield. Regarding the drivetrain, I went the modified route and it turned out to be a real nice driver on and off the pavement.
I have a build thread going for the K20 called " 1966 K20 adventure rig ". Should still be on Page one.