Not a lot of progress of late, however I did get to spend some time in the garage today.
Managed to lift off the old tub, and it is sad....

- Transmission case date code.jpg (42.92 KiB) Viewed 91 times
Transmission Date code of Feb 26, 1944.
Though I have spent some time trying to work out the Chassis number and estimate the USA Rego number.
Here goes...
The Engine number is 371922, the Tub is ACM2 and is 23298. The last two digits on the chassis were XXXX82. I am also guessing the DOD as March 3, 1944.
WIth some help of the internet, I found engine numbers of 372181 and 372792. in both cases the Chassis numbers were about 61500~ lower than the Engine.
Playing with Excel, I worked out a formula to calculate the Chassis number where the gap was between 61640 and 62600. Knowing the last two digits (82) I have calculated that the Chassis should be 310282.
With Robert's help (of Data Plates fame) I have calculated the USA Rego # as 20488278