
John Sims site is one of the best sites for all things Healey, the technical section contains a collection of articles from various sources. The Don Hardie's 100 Technical pdf is worth the download.
http://www.healey6.com/technical.htm
Larry Varley's site is full of very interesting articles as well as a detailed restoration of a 1955 BN1. You can also follow his latest project a restoration of 1959 Healey 3000 Mk1.
http://www.acmefluid.com.au/larry/
Steve Thomton's Works Rally Tribute Site. Details the building and modifications for a rally replica.
http://www.stevesaustinhealey.com/