The kit is mostly Fletcher before being refitted in August 42 with a second 40mm mount on the fantail. The 5 inch mounts have hoods for the mount captains, which is wrong for Fletcher for the Guadalcanal time period. The Mk 37 director has an angled back and is also not correct for any Fletcher. Some of the detail such as the position of the navigation sideboards suggests that Revell used the available Bath Iron Works plans which are more typical of units such as O'Bannon, rather than Fletcher, which was a Federal build.
For a Guadalcanal Fletcher you will at least need a second 40mm mount, some correction of minor detail, and as much or as little photo-etch and additional bits as you desire. By March 43 Fletcher also had an additional 20mm atop the pilot house and either had restored (or never removed) all four 20mm guns in the waist for a total of seven.
I didn't use the available etched main deck railings (wire rope) from the Eduard set - they are actually wider and less scale than the kit supplied plastic stanchions. Both Eduard and Nautilus have etch for this kit and both have advantages and disadvantages.
Model Monkey and DiStefano at Shapeways between them make just about anything you could want to change out parts for this kit with 3D equivalents. There is very little resin currently available, the best of which are the L'Arsenal 20mm mounts. Nobody currently makes a 40mm mount precisely like those carried on Fletcher, but you can get 3D or white metal that will get you close if you don't want to scratchbuild.
Rick's round bridge Fletcher book is an essential reference, and the Fletcher crew reunion site - ussfletcher.org - has some fabulous photos of this destroyer, as well as one or two that aren't Fletcher at all. Plenty of other online references for Fletchers of all vintages as well.