Hi Dan,
I posted a similar question once with no response...I used Eastwood and memory from previous retos for a guide. I think it is fairley correct for most GM's of the era.
I used spray gray, detail gray, chassis black, (semi gloss), underhood black, etc. try
http://www.eastwoodco.com/
One tip is the power brake booster Delco Morraine was cadmium plated and Bendix boosters are black...I would like to get a list together some time for a reference for people who are doing stock restorations...Good luck and post some pictures of your progress..