Oracle, Stored Procedures, and large data types

I am trying to use stored procedures in both Delphi 1.x and 2.x and have
run into a problem.  Delphi's stored procedures don't support data types
larger than the 255 character string parameter.  I need to send larger
pieces of data(such as the TMemoField contents), but I don't want to use
the Data-aware components.  Does anyone know how I can get around this

Thanks for your time.

K. Wade Turner