Slant 6 Torque Converter Bushing

In my previous posting, a reply from SlantSixDan has made the following point:

"If your car has an automatic transmission, you have to hope whoever swapped in this engine knew that when putting a '68-up engine in front of a '67-down transmission, you need a ring to take up the space between the small-nose torque converter and the large-bore crankshaft, else transmission front pump bushing and seal life will be short".

Has anybody carried out this modification, if so, has anybody got a dimensioned drawing so I can pre-make the required parts?