Check Weaver's website; they have a chart of bases and I'd be surprised if the 141 was missing, though I don't think most were drilled and tapped.
There are lots of these rifles for sale in the obsolete .30 and .32 Rem, the .35 Rem is a bit harder to find. Lots still in use in this part of the country.
I have fired two; the action is slick and solid. I'd use the .35 Rem pretty much anywhere I'd use a .30-30, and there is Leverevolution ammo made for them. One thing most gunwriters seem to agree on is that the .35 Rem is at its best with 200 grain factory ammo or 180 or 200-grain handloads. The 150 grain loads apparently lose power very quickly. This is just from my reading and no actual experience.