I recall my 1954 3100 as 61" (drum face to drum face).
FYI: a 5 lug rearend will not be close to stock, will not use stock wheels or tire (sizes)or hubcaps.
I'm thinking the truck no longer has the enclosed driveshaft or stock transmission.
Consider more about what you want to achieve and ask questions how to get there. With a little more for us to chew on, we could be more helpful. Good Luck
