1) What's the appropriate thread here to search for parts to buy?
You can post and search for parts here:
http://67-72chevytrucks.com/vboard/forumdisplay.php?f=5
Another good place is here:
http://car-part.com/mobile//index.htm
I have found good parts in the salvage yards for my truck. And then this a list of all the other online places to search for parts. I have used all of them.
http://www.usa1industries.com
http://www.lmctruck.com
http://www.classicindustries.com
http://www.truckandcarshop.com/truck...t73_cover.html
http://www.classicparts.com