Hi Paul
I think that is Exactly what I'm after
Thanks you so much
Jim

Not sure what spec's you want?  Are you wanting the correct advance readings vs Vacuum?  From a Sun Electric sheet for 1956 Fords - Ign.advance is 11-13 deg  @ .88"  &  22-24 deg. @1.73". 
Also Dist.rpm readings at 800 rpm is 5-1/2 to 6 -1/2 deg
                                     1200 rpm is 8-1/2 to 9-1/2 deg
                                      1600rpm is 11-12 deg
                                      2000 rpm is 13-14-1/2 deg
Above are Distributor degrees, not at the crank
Hope this is what you want?..

 



Paul

I'm working on a 56 Y-Block distributor.
I'd like to know where I might find the original specs for the dual diaphram adjustments?
Anyone know where these might be found?
Thanks so much
Jim