Ok..so i got a better look at the engine casting number today..
and it is - 3835692 which makes it a 1952 235 c.i. and also correlates with the head casting number. I guess the ebgine number might begin KEA but i stil reckon it looks like LEA!!
I also took the VIN number from the truck rather than the paper work!!! what it actually says is - 21JPF10857 which makes it a Janesville 3100 from June 1951! Making it i think the 9856th truck to roll of the line that year??
It's just a shame there doesn't seem to be anyway of finding out any history of the truck.