Too many variables. When you say “didn’t heat very efficiently”, what do you mean? Did you measure the flue temperature, or did you just think the house was cold and drafty?
You need to get someone with knowledge in you basement.
Loving old things, this is hard to admit, but getting a new, high efficiency water boiler would probably be the most efficient thing you could do. Properly installed, condensing systems are amazing.
Ever experienced radiant floor heat? It's the best, most efficient way to heat, bar none. It's like the Sun shining out of the floor. You heat the objects in the room, rather than the air and you are in contact with the heating surface, so lower room temps are very comfortable. Much lower boiler temps are used, i.e., non-condensing, because the supply temp only needs to be about 125F. It's easily adaptable to solar, outdoor fired wood boilers, LP, natural gas, fuel oil, whatever. I put it in my house when I built it about 15 years ago. I've since installed it in my hangar and greenhouse, too. Toasty! (and we spend about 1/4th the cost of what my neighbor pays to heat with forced air)