There were only 5 colors available in 1968-70, the closest match is L567 Ivory. It may not be a stock color, but I like it.
No kidding about April. Here's what happened last April at Barret-Jackson.
http://video.app.msn.com/watch/video...4e%7C%7C%7C%7C
An over-restored bone stock 1963 23-window bus sold for $198,000. I've stood next to and not touched better (an OG '54 barn door with right-hand drive).