"Avanti 1962-1990" is a Brooklands Road Test Books.  It's available at the
Museum, or at least was a year ago for $16.95.  If the museum is sold out,
Brooklands can be contacted direct at (800) 826-6600.  This is the 81/2" by
11" or so reprint book of road tests from many different magazines.

-----------------------------

The best history of the Avanti is to be found in a book titled "Avanti!" by
Bonsall. I bought my copy from www.motorbooks.com