I have a friend that has a 56 Bird. He went to a B manifold and a later Holley. The only problem that he had, if I remember correctly, is that the mounting flange for the bell crank was lower on the B manifold. Otherwise, it fit. Spacers on the bolts did the trick. I assume a sedan is the same.
For the mounting of the bell crank, I always put in studs in place of using bolts. Much easier to install and remove with these.
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ