pilot bushing pilot bearing????

so i was thinking about this for some amount time. i'm not to familiar with the 4speed yet and was wondering wat would be better to use for my 410 stroker??? pilot bushing or bearing, i believe i told my machinist to install a pilot bushing? wats the difference?? and wat is better to use probly a little late for this question but thought i would ask before i take my engine off the stand pretty soon. thanks