Many years ago at a gun show I bought what I thought was a prewar model 70. When I had a friend look at it, he commented that it was all model 70 except the action, which was for a model 54, so it must be possible to do this. As I remember it even had a model 70 bolt release. ( note below, ;<) )

I learn something every day, and a lot of times it's that what I learned the day before was wrong