Thanks Mek-Dangerfield!
I also took a look at my manifold and it says "360 Offenhauser" on it. I haven't figured out which exact model yet, so I'll have to take a closer look at it tomorrow morning in the light.
Again, I'm a novice at this so, I'm not sure if this is a good manifold or not for a more upgraded carb like the Proform.