A-Body 340-360 Exhaust Manifolds

I have one of the 3880905 driver's side a body 360 manifolds. The port size is the same as a 360 truck manifold that i have, i measured them just this morning.
The openings are approx. 1 1/8'' on the single ports, and about 2 15/16'' across the middle port.
The a body manifold has a bell at the bottom of it and the exhaust pipe attached was 1 1/2''.
I think they changed the manifold for a 360 a body for '75 to a bell outlet as well as the bottom of the manifold has extra material cast into them to cover the air ports in the head.
I took pics if you guys want to see the comparison.
I hope this helps.
Tom.