I would have them checked out by a gunsmith. There were some Mosins and other military rifles that were rechambered to .30-06 where they did a poor job and there were some isues with them being safe. SAome were completely rebarreled and would be fine. My concern with the Mosin would be that of converting it from a rimmed cartridge to a "rimless" cartridge.
Not saying that yours can't be shot, but I'd definitely let someone check chambering and safety issues first.
Well, I went to a gunsmith, both are not chambered to 30-06, He explained that he wouldn't even fire them, just clean them and hang on the wall. That was a bit disapointing. However, he did tell me that he had never seen a Arisaka like mine Whomever did the gunsmithing was good and did very well.
Now I'm wondering about selling them. How much do you think they are worth?
I gave a sporterized Arisaka to a gunsmith friend and he told me that as the war went on the Japanese rifles became less well made to the point of being dangerous with anything more than factory ammo pressures. Just my two cents worth. Always be safe!