There are actually several SNJ's flying today with tail hooks:
N518WW
N3JC
N5615C
N621BC
N1666T
G-BRVG
N7055K (unfortunately was heavily damaged last year)
and a few more I'm sure...
I also know there is one at the Argentina Naval Air Museum (non-flyable) still fitted with the tail hook.
Neil, regarding Chuck Wahl's SNJ which you mention (N5615C), the tail hook (original to the aircraft) is a neat feature, but over-all the reason why it is such a special restoration is that each part has been restored to have the same original factory finish and details it had when originally manufactured, including all of the original inspection stamps (NAA and Navy Pensacola), original 1945-era Alclad watermarks on the metal skins, all original interior factory hardware and equipment, and the list goes on. The exterior glossy blue and markings are also 100% authentic based on specifications in-place when it was originally manufactured. The aircraft never did sell, and remains a very active flyer in Chuck Wahl's possesion (along with his other award-winning restoration, a T-28) - his SNJ has continued to win awards in the time since it originally debuted. The archive of that restoration remains available here:
http://vulturesrowaviation.com/snj5c.html
Chuck Wahl ended up forming his own restoration company, and has been working on the ground-up rebuild of a Helldiver and SBD Dauntless which will be flying when completed, and 100%, without doubt, future award winners as well. Following these, there are one or two more Helldiver projects awaiting them, which will also be restored to fly. Having re-manufactured a set of lower landing gear doors for the Helldiver they are currently working on, which are extremely rare (not even the NASM Helldiver has them), they also manufactured a set for the CAF Helldiver and sent them to Ezell Aviation to fit them to the CAF Helldiver. Since earlier this year, the CAF Helldiver, for the first time since it was originally in service, has been flying with the lower gear doors fitted.