www.tomyang.net

Apologies for the second post, but found that this 500 Superfast (s/n 5989 SF) was noted to be color Azzurro 19278 M.

http://www.liveauctioneers.com/item/8463586

Perhaps this vehicles current owner may have records that would be of assistance?

Perhaps this may be of some use: http://www.330gt.com/encyclopedia/paintcolors.htm

Perhaps this web page will be of assistance...

http://ranwhenparked.net/2013/04/24/a-l ... cessories/

Vintage advertisement...

Perhaps an 'ultrasonic bath' cleaning or 'extrude honing' process would be useful to clean and smooth the interior of the fuel rail. Although, according to the most recent OP writing the 'gun cleaning' process seems to have been effective and a new source of contaminant may have been discovered. Goo...