I've recently had a very early Lo-Wall converted from .25RF to .38 Special with all the appropriate receiver internals properly done.  I now have a very usable rifle with the original Lyman tang peep sight.
Are there many '85 admirers who would be interested in a converted caliber 1885, and how deeply into their pockets would they dig to buy one if found~?  It was converted to .38 Special because reloading components are so readily available.  The stocks were also stripped to the bare wood and refinished the old fashion way with hand rubbed BLO.  Nothing at all was done to the exterior metal parts which if done would make a beautiful rifle.  I have no plans to sell this unique specimen in the foreseeable future.

Your suburban is only worth what someone is willing to pay for it.  I'll give you a buck two fifty if it runs. 
A low wall in 38 special may only be worth under a $1000 or so unless it has special features unless you find someone who really wants a shooter in that caliber. I am working on (someday) putting a 357 magnum barrel from a Ballard onto a small shank high wall and reaming it out to 357 MAX just because I can.  I found a reamer on eBay cheap.  I am doing it just to try that chambering knowing I am not really adding value.

Jack