I have a (nearly) original ‘03 Springfileld. Barrel stamp is 5-17, and the bore is in pretty good shape. It had a non-original bolt with the swept-back bolt handle when I bought it. I did find an original bolt body and transplanted the firing pin assembly and extractor. Headspace seems OK, and if anything, it is slightly tight. The original handguard was longitudinally split, but I found a new-condition replacement that appears identical to the original except it is in noticeably better cosmetic condition than the stock. I also stained the handguard a little darker to better match the shade of the stock. The stock is not bad but does show service use and wear. BTW I also have a 1918 Colt M1911 to go with it. Plus a Colt M1917. I once had a M1917 Enfield, but sold it long ago.
Joe Poyer’s book, “The Model 1903 Springfield Rifle” contains every detail you would ever need to know about the original ‘03s, their variations, and also the WWII versions, plus bayonets and all accoutrements. Highly recommended.
The consensus opinion is that Sgt. York probably had a 1917 Enfield, but there are differences of opinion on that point.