Need a measurement off the back of a 401.

[derf]

Is there someone here who can do me a huge favor?

I need to get a measurement off a 401 that's out of a vehicle (or at least without a transmission behind it) with the crank still in it.

I need to measure how far out the mounting flange on the rear of the crank sticks out past the face of the bellhousing. It needs to be the outer part where the bolts go through, not the centering ring in the middle.