That's a nice looking snake you acquired, great mass and apparent body weight! You didn't indicate whether it was wild caught or captive produced, but I am going to go out on a limb and guess it was WC. It seems most of the D. m melanurus and D. m unicolor being imported these days are collected from areas where the two subs overlap and there is much evidence to suggest the two integrate within such areas.
Anyhow, they prefer temps on the cooler side and I have found 73-75*F with a warm spot of 80* - 85*F to work well. They are large, active snakes, so I use enclosures measuring 8' x 4' x 4' for adults and provide a large water tub, humid hide and climbing opportunities. However, many have done well using 6' x 2' x 2' enclosures as well, but the more room you can provide the better.
All Drymarchon are hydrophilic and require copious amounts of clean water for drinking and soaking. It is imperative to the health and well being of these snakes they not be allowed to become dehydrated, as such will bring about the demise of a Dry faster then most anything else. Also, it is normally best to provide smaller meals a couple of times per week, rather then offering a single large prey item once per week, as they have difficulty swallowing larger prey items and their high metabolism translates into a preference of more frequent feedings, which further translates into more frequent enclosure maintenance.
Anyhow, there is a great deal of variation between D. m melanurus and D. m unicolor, but they are all great animals to work with..
Best of luck to you and congratulations on the acquisition!
Jeff
PS: How is the Kentucky pine project coming along? I heard you guys located another one in the field somewhat recently! Great news!

-----
Jeff Snodgres
University of Arkansas
snodgresjeffreys@uams.edu
501.603.1947