Basically they're just good workhorse rifles, pretty darn accurate, and can last centuries with proper care
If you need new wood, look to Boyd's Riflestocks...they've got a Walnut for the 81C (same thing) which fits with a little minor inlet work...
http://www.boydsgunstocks.com/MARLIN...-p/300-240.htm
The 81C was the plainer version...made from 1940-1970,
while the DL was a bit more pimped w/ Walnut stock, target-peep rear, hooded front, & swivels, made from 1940-1965.
(Stoeger shows the Discontinue Date to be 1965)
They were an improved version of the 81/81E (1937-1940), and were replaced by the 781 (better trigger, improved bolt & checkered stock) in 1971
Probably the only thing it'll need is new springs...and you can use modern tube-mag springs cut/made to the same length...
same for the FP spring/etc...
Numrich has a lot of the parts you may need...
http://www.gunpartscorp.com/catalog/...spx?catid=4090
Front Sight...they've got the insert, but not the base...pics don't show the sight, what's the issue??
Hope that helps