Whether in carbine or short rifle version, you'll like the 20" barrelled Miroku. Very quick and responsive between the hands. Don't know whether this fits your plans for the rifle, but I'd recommend installing a solid aftermarket firing pin extension. The factory safety interlock is pretty reliable....I ran mine for over 15,000 rounds before making the swap. Installing the extension is dead simple....taking only a few minutes, for anyone familiar with stripping down an 1873.
But...like anything mechanical....especially firearms....the more complex they are...the more prone to eventual failure. So...the switch. If I hadn't been subjecting the rifle to the hard use seen in cowboy action competition....I likely wouldn't have bothered. Also.....I felt that the solid extension gave me bit snappier blow on the primers. The stock firing pin response always felt a bit "mushy", to me. It was reliable... but I couldn't get used to the feel of it. Your experience may differ....my experience, only.
I like the Miroku/Winchesters, too. Excellent build quality....inside and out. My only beef with them is that aftermarket parts for these rifles aren't as readily available...yet... as from say, Uberti