Check primarily Papajam's posts here:
http://www.alfabb.com/bb/forums/carburetors-fuel-injection/38126-twin-points-distributors.html
and here:
http://www.alfabb.com/bb/forums/alfa-romeo-cars-sale-wanted/46818-dual-points-dizzy-ebay-gta.html
Lots of stuff already written on the BB, if you know where to look (or how to search?).
http://www.alfabb.com/bb/forums/carburetors-fuel-injection/38126-twin-points-distributors.html
and here:
http://www.alfabb.com/bb/forums/alfa-romeo-cars-sale-wanted/46818-dual-points-dizzy-ebay-gta.html
Lots of stuff already written on the BB, if you know where to look (or how to search?).