You REALLY need to know if the rear receiver bridge has been ground and contoured or not. There were several different profiles for this grinding, depending on what factory or shop did the work.
Look up in a Weaver listing; they are listed as "ENFIELD 1917" or as "US 1917 Enfield". For the front, you can use a standard WEAVER 46 on any of them. My own butchered P.-'14 has just has the ears removed but the top of the rear bridge has NOT been contoured at all. I have a Weaver 79 on there and it works just fine on mine, so it should work on yours, too.
My rifle is a Winchester that was given to me for parts after Bubba tried to sporter the poor thing. A friend greatly admired the wood and asked what I wanted for it. The rifle was a gift, so I could not sell it, of course, so I told him what had happened and gave it to him. He took it home, played with it a while and plugged the hole in the chamber and re-cut the barrel so the muzzle no longer was at an angle, bedded it, installed a pressurepoint. We re-proofed it, played with it for half a Summer, then he gave it back to me when he was tired of playing with it.
This was the first rifle I ever owned which could be RELIED upon to provide regular and consistent HALF-INCH GROUPS. And it's just an old war-weary Bubba rifle with that ugly Enfield rifling. One thing it has taught me is NEVER to dismiss or disrespect the old guys who built those things: they knew what they were doing, believe me. The rifle has no price. It's only too bad that I have no son to leave it to.
Hope this is a little help.
Have fun!