Hi Carlos,
I was a gunner on AC-47's at Bien Hoa in '68. The reason for the two names was "Puff the Magic Dragon" was the nickname, especially during the early deployment, and "Spooky" was the call sign. There were two major modifications, the early ones used SU-11 gun pods, the kind that were carried under the wings of A-1's, etc. There were two firing through the windows and the 3rd firing out the back door. Later on they were changed to an MXU-450 (I think!) gun module, which carried more ammo and had a faster rate of fire. A window was cut out next to the door for the 3rd gun, which freed up the space by the door.
There were two squadrons that belonged to the 14th ACW, the 3rd and 4th Air Commando Squadrons, coded EL and EN. There were two major color scheme's, one had a gray underside, later versions had a glossy black underside. There were no nose art, at least when I was there in '68, other than the the "Ghost" emblem.
The Silver gunship was one of the prototypes that also had the Dragon painted on the nose. The Squadron book is pretty good, but devotes more pages to the AC-119's and 130's, which I was an instructor. By they way, the AC-130 of today is NOTHING like the 130's we had back then.
If you need any more info, e-mail me and I'll try to help. I'm building a Ziroli AC-47 that had the tail code "274" that crashed on Friday the 13th. There's a correlation between "274 and the 13th, I'm sure you can figure it out!

Jon

"Spooky-RVN's premier fly by night outfit"
When you're hurting enough to call the very best!