Need a good one with lots of detailed pics. Mail order, download, or?

I believe no matter who you purchase an assembly manual from, they will all provide the exact same item. My 66 was about $20 if I recall.

Best $20 you'll ever spend. All the reproduction companies have it for sale...OPG, Year One, etc. I've referred back to it numerous times over the years.

^ RedElky is right. The Millenium Industries photocopy is all that is available. I have one for mine, though I find it quite disorganized. I was lucky enough to get the Fisher Body Service Manual, and the Chassis Service/Overhaul Manuals with my car. I've actually made more use of them so far, but will likely rely on the Assembly manual as soon as I get remotely close:( to assembly:)