Sounds great, Marrakai. All 3 classics.
I've used my bro's Lightning in .45 Colt chambering in a couple cowboy action matches. It is a lightning fast shooter. What a rifle!! His Henry in .44/40 is also fun, but slower in operation. The pump-gun is VERY fast firing.

How are the bores of the Lightning and M73?

Sad about the Sharps. They were quite interesting.
The .50/70 Sharps m59 barrel I have, was sleeved and re-chambered/converted for the center-fire ctg. in the 1867 Government contract with Sharps. Originally, it was a model 59 linen ctg. Carbine barrel. Yours is a bit earlier yet.
Maroon ScotchBrite on a jag, lubed with a thin oil like WD40, and scrubbed back and forth full length, can do wonders for a 'rough' barrel.