Nothing wrong with .45/70 Government. I don't own one, but I've loaded some light loads for a friend with an old one when he got leery about feeding it the new stuff.
Only possible objection might be the cycle time on that long shell when you're in a hurry . . . one time that the, ah, full-figured .348 Win has an advantage . . . :-D
The .348 win may have an advantage but the Marlin lever action has a very quick cycle time.