You are worrying about nothing.
Think about it, the machining operation to ream the hole for the pilot bushing to fit in is the last operation. By then the crank has been drilled, probably by a single stepped bit with two diameters. And you'd better believe that there was NO TIME to do any fixes when the engines and transmissions were being put together. So if it already has a pilot bushing in it, it has a hole deep enough for any transmission shaft they were using. For that matter, the hole was present in almost automatic cars until at least 1970, just not reamed. There was a special diameter pilot bushing you could get from NAPA that was for the non-reamed hole, if you were putting a stick behind a factory automatic engine. But many many automatic cars will have a pilot bushing hiding in the crank under the torque converter nose.

In any event, the hole is deep enough.

R.