Unknown if this is the one or not, but here is more info to look at:
http://www.mustangsmustangs.com/p-51/p51survivors/pages/44-74902.shtml
aka: 44-73902
1954: to Guatemala as FAG 315
1972: N38227 (Don Hull) return to USA
1978: (Connie Edwards) storage
2001: the last of Connie Edwards many FAG Mustangs
P-51D-30NA
44-74902
N38227
Owner: Connie Edwards
Base: Big Spring TX
Status: Storage
Some more P-51 listings
http://www.mustangsmustangs.com/p-51/p51survivors/p51listD4.shtml
http://www.mustangsmustangs.com/p-51/p51survivors/p51listW.shtml
Hope you find your answer
Walt