For what its worth I finally got my hands on the rifle. The block is not too much of a problem to make .
I used soft pine to make a pattern and duplicated it once fitted in hard maple, as it is easier to machine. It uses the original 6.5 clip to hold it in place and a groove is cut on the bottom for the lifter. a 1/2 inch ball mill makes a perfect groove in the top for the cartridge to feed from. No modifications to the action or clip and it will eject the same out of the top if needed to be removed.
I am not making any claims that this is the correct or authentic way it was done from the factory but
just what will work without modifying the rifle.
I can post photos if interested.