intake elbow question

Hello,
Can anyone tell me what the distance of the intake threads is, to mount the intake elbow onto the manifold?
I have a 460EFI, and want to customize some things.
The intake elbows for the 4.6 modular are widely available, and i see almost nothing for the 460EFI.
Therefore (as the rectangular shape looks equal on the pictures) i wonder if i can put, for instance, a 78mm BBK intake elbow from a Mustang GT onto my 460.
To know for sure, i need the heart distance between the holes/threads

if anyone could help me out, i'd be very happy