Here is a short thread on the Scott Cook manifold: https://pantera.infopop.cc/top...lane-intake-manifold
You can see where the carb bolts on and the width of the holes and spacing to allow the square bore carb to operate (strictly speaking the holes only need to be round, not large elongations as you see in the thread). If you do go down the road of the Scott Cook intake, then just be aware that I think it only comes with so-called 3V ports (I am not sure if it also comes with 4V ports) on the head side. These are revised ports with optomised flow compared to the original manifold and other manifolds of the era and are slightly smaller than the 4V ports in your head. The reason for this is that ideally they can be combined with Scotts 3V style heads (made to appear identical to the original Ford heads), better cam etc to give vastly superior performance, but an engine that looks completely stock standard and original. The 3V ports will bolt up fine to your head and should give better torque and low to middle range performance due to the better airflow. I have the Scott Cook manifold on my Pantera with a standard iron head with 4V ports and I haven't had any problems. If you are dead set on having 4V ports on your intake manifold then I would suggest the Blue Thunder intake, as others have suggested here.
Cheers, Tim.