That Mod. 70 is/was also sometimes called a Ranger.
I have one in 30-06 and believe the lack of a floorplate is a desirable feature. I recall watching a close relative show off his new something-magnum rifle to me, very expensive gun. He took one shot and the floorplate flew open dropping his ammo on the ground.
This is not an unusual happening with floorplates. But it can't happen with your rifle the way it is right now.
It only takes a few seconds to unload a blind box (no magazine) rifle. Wats the fuss?