Biff9703

Hey guys! I'm restoring a 68 Chevy c10 shortbed with a 396 big block. I want to do a Fitech fuel injection system and a 4l80e transmission. I know there are a couple of things to get the trans to work, a trans controller and some type of spacer for the converter to match up with the flexplate. I know about the controller, but not sure how to source the spacer. Maybe someone can point me in the right direction. I know this swap has been done before, but I don't have all the details. I live in Sherrills Ford N C if any of you have heard of it. Thanks in advance for any help.