in reading through these Forums, I found that some members had success using the pilot bearing and some members said they failed. I read one post that said when the trans was pulled, the pilot bearing flopped out. It made me wonder if it was previously just hanging on the input shaft. I was also talking to an older engine builder and he said he didn't like pilot bearings because dust may cause them to fail.
I feel like what Chrysler did originally is best. I still haven't found any documentation on what the crank pilot hole ID should be drilled to. I couldn't figure out that calculator at oilite.com. I called Oilite Tech, but they were no help.