i just measured a 440 crank in an engine i have on the stand.
it happens to be an eagle 8 bolt crank, so take these dimensions for what they are worth.
the torque converter register bore is 1.812 in diameter, and .668 deep.
the second pilot hole is as Mr. Kunkle said, .9375 in diameter, and is 1.050 deep from the .668 converter depth, or 1.718 deep from the flange.
the final pilot hole is .845 in diameter, and is 1.700 deep from the .668 converter depth, or 2.368 deep from the flange. this is the depth of the diameter to where the shoulder of the drill stops. it does not include the drill taper or point depth.
this is just what i have on my crank that is easily measurable.
your crank will vary..............[just thought of something funny after i wrote that. ]