Let me add to the list of those who urge you to leave it alone. That rifle would go for around $700-800 in this neck of the woods.
After you drill and tap it it would then be a $300 gun.
If you are hell bent on losing $500, why not just spend the money and find a decent hunting rifle? A sporting rifle will generally be lighter and easier to mount a scope on.
As was mentioned, a lot of SC's came with Remington bolts. It is very likely that your rifle is original as issued, and altering it would just be destroying another piece of history.