BH29F8B105528 1968 Barracuda Fastback

A year ago I bought a 1968 Barracuda Fastback #BH29F8B105528 Burgundy Metallic w/ red interior. Most of the original drivetrain has been replaced (now a 72? 360ci w/ TM5 single plane and Holley 750cfm and nitrous in front of a smallblock 727 and 489 case 8 3/4" rear). I am looking for original certicard, broadcast sheet, and dealership where it originated from. The car was a (complete) barn find last titled before me in Missouri. If, as I believe, it was raced in Missouri in the 70's any history would be helpful. Thank you in advance