Have you seen/found/read the two Stovebolt.com Tech Tips?
Also: do not be scared-off the need for the 47-53 carrier replacement in a 1954/55st job.
Finding the 4.11 carrier is far more difficult than replacing the carrier (post a Part Wanted ad here).
The change is not exactly "plug and play".
And, you will need to buy/borrow some tools (as shown in the Tech Tips).
We cleaned all parts/housings and did the first conversion in two 4hr sessions.
The second time we did it in about 4 hours (including cleaning all parts - which took a couple hours).
I had help from a friend who is a mechanic, but he had never been inside a Stovebolt enclosed driveline.