Does anyone know the spec on the proper face height of flywheel

Just covering all possibilities. My flywheel has been surfaced many time over the years. I realized I could measure it if I pop out the starter.

Can someone provide what the spec height is from the face to the shoulder of the ring gear? This will allow me to get a baseline.

I just happen to have one.
0.24" maybe its been turned, maybe not.
0.39" flywheel thickness
0.63" from clutch disc surface to base of ring gear. '73 18V engine
RS

Thanks!

The Huffaker book in the Racing Directory, above, has some commentary on minimum flywheel thickness.