You hit the nail on the head Roundsworth! Plan on either making new mounts, or ordering mounts from one of the other makers. You might consider the Leatherwood scope and mounting system for $400 at Buffalo Arms. More money for all, but it will be right to start with.
I robbed the mounts off an old Winchester scope to put on my brass scope which had the crappy octagon brass mounts. I tried reworking the originals with a finer screw adjustment at the rear, but the hokey windage on front never worked. 
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These mounts work way better, but don't have enough adj. to get much past 100 yds with my .45-70 Hepburn. The scopes are actually pretty good optics!

There's that beautiful Hepburn again! Didn't you start out with a bare receiver on that project? I will check with Buffalo Arms. I know MVA has a nice set-up, but it is out of my reach right now. The cost is somewhere around $1000.00! Thanks.

I just got a press release late last week that the Leatherwood folks have recently come out with a new shorter c.1900-style scope to go along with the full length one.  Unfortunately it is from their marketing outfit and does not have a link to leatherwood's site.  I really like the look of it and am going to try to obtain one so we can give it a test.
Wayne