Basler does conversions of these and has photos:
http://www.baslerturbo.com
You might even get the good old US Forest Service to take you up (official business of course).
The DC3/Dakota Historical Society might have some links on their forum
http://www.aircareintl.org/dc3society/index.html . Aircare did a champagne flight recently on a DC3 (California based).
Here is a listing of all known DC3 flights that someone is compiling
http://www.centercomp.com/cgi-bin/dc3/flights?9715 --useful and recent.
[This message has been edited by BlondeBomber (edited 01-13-2001).]