The magazine provides "sources" at the end of the article but they don't include part numbers. Why not?

At the "source" I found this:

http://www.malloryperformance.com/P...ID=5265&selection=&minselection=

I didn't look very hard but I did not see the "custom" option for the adjustable vacuum advance.


1946 Chevy Half Ton
('56 235, '86 T5, '79 Camaro Z28 rear end, working on the '85 Jaguar XJ6 IFS)
1976 Margay Panther X, MC91B