ECE (Early Classic Enterprises) has a great kit, I haven't used, but I have heard good things about their kit. CPP (Classic Performance Products) also makes a kit. From what I've read in the forum, ECE has great customer service, and quality parts, and CPP has had problems when shipping parts, and having to contact them 2, 3, or more times to get the correct items. A couple of weeks ago I asked for a list of parts, so check out the link below for a list of MOOG parts which are very high quality. (These parts can be purchased at O'Reilly's or other parts stores)
http://www.67-72chevytrucks.com/vboa...d.php?t=233983
ECE link:
http://www.earlyclassic.com/
CPP link:
http://www.classicperform.com/
Again, I haven't ordered my kit yet, but if I was going to order a kit I would go with ECE. Hopefully this will answer your question... or at least put you on the right path!