Hi
i have found this text that suggests the aircraft May have been 54-1629
Although the AC-130 gunship programs were considered highly successful, the slow-moving airplane was very susceptible to ground fire. Consequently, eight AC-130s have been lost during combat operations. The first casualty took place when tail number 54-1629 was hit over Laos and crashed during a landing attempt at Ubon, Thailand. A second AC-130 fell to enemy fire over Laos in April 1970. The third and fourth losses took place within hours of each other in the spring of 1972, and a fifth was shot down a few weeks later while supporting friendly forces during the siege of An Loc in South Vietnam. A sixth gunship was shot down over Laos in December 1972. A total of 75 crewmembers were lost in the AC-130 mission in Southeast Asia, before hostilities ended in 1975. Since that time two other AC-130s have fallen in both Kuwait and Somalia.
Credit : http://www.theaviationzone.com/factsheets/ac130.asp
Originally, C-130As were converted into side-firing gunships during Project Gunship II and the follow-on programs, Projects Plain Jane, Surprise Package and Pave Pronto. The prototype AC-130A (#54-1626), previously designated JC-130A, was tested at Eglin AFB, FL and in Southeast Asia during 1967. A short-nose Hercules, it was a basic C-130A with the addition of four 7.62mm General Electric XMU-470 Miniguns, four 20mm General Electric M61 Vulcan cannons, an analog fire control computer, a Night Observation Device (NOD) or Starlite Scope, a "bread board" computer, and a 20kW searchlight. Project Gunship II was a great success
http://www.spectre-association.org/listingsA.htm
Terry