Archangel: I have a sporterized Enfield in 270 Win. The work was done in the fifties, and I bought it off the original owner. He wanted the cheap route to a new rifle.
At the time those M1917's were worth about $15.00 when a Model 70 was $109.00. Of course the rifle he modified would be worth twice what it is now, if he had simply left it alone. But then he got to shoot what he wanted 50 years ago and that was the point.
Milling those rear sight protectors off is time consuming and expensive. But once done, you have an excellent action to use with a scope.
I would recommend you find a nice pistol grip aftermarket stock, something with a cheek piece, put on a recoil pad. As the M1917's are recognized as too valuable to convert to sporters, stocks will get harder to find. And you will like the ergonometrics of a decent stock. It will put your head in line with the scope and your finger in line with the trigger.
Also, if you have the original mainspring, replace it with a Wolf 18 pounder.
http://www.gunsprings.com/RifleShotgun/Enfield_RsNF.html You will find the original mainspring is weak, and putting in a new one will crispen the trigger and quicken the lock time. Don’t go for an extended strength spring first off, as those make that action difficult to manipulate.