Some good info here: http://www.ebykr.com/2006/06/drysdale/

and here: http://www.bikecult.com/works/archiv...rysdaleTN.html

and some photos here: http://www.classicrendezvous.com/USA/drysdale_alvin.htm

I'll register my unsolicited vote to leave the original paint and 'patina' untouched, unless there is serious bubbling rust destroying the integrity of the frame.