Things to look for.
* many different rear sights, from a complex micrometer adjustable rear(early), so a simple stamped slide(mid), to a simpler flip (think A1 AR) sight (late) were all used on WWII Enfields.
* Lee-Enfields can be adjusted for headspace by changing the front of the bolt (it screws off). The front pieces are numbers 1, 2 or 3. Large number = longer part. If you have a rifle with good headspace on a 1, then you can go to a 2 or even a 3 over many many many years of shooting. If you are starting off with a 3... your options are somewhat more "limited"
* Lee-Enfields could be fitted with rear buttstocks of varied size based on the soidier, so a both a Tall and Small get the right sized stock to shoot well. Sizes from "Bantam" (Ultra small) to Small, Medium, Large (look on the underside of the stock for a letter stamped into the wood.
* Many of the Savage - Stevens had 2 groove bbls. (don't worry they shoot fine! - U.S. did the same thing with 1903 Springfield production in the WWII years too with no loss of accuracy) Take a look down the bbl to check yours out and let us know.
Congrats on a GREAT rifle. If I had to take a bolt action to combat, the Lee Enfield would be THE choice.
BIGGER_HAMMER