I was somewhat lucky with my 71 demon 340. I found the owner of my car from 1973 to 79. They were able to tell me a lot about it, it was ordered by the lead mechanic at bettenhausen dodge who owed it only a year or so then sold it to a friend of theirs Tom Reynolds who had it about a year and then sold it to him, he just added headers and it would run hi 13's 14 flat. Anyway I contacted bettenhausen a scat pack dealer back then told them the story, they said all records were kept 10 years then destroyed, but said they would ask the owner. He said he could not recall the car or even the mechanic, said they sold a lot of hot dodges back then thus the scat pack designation. They even asked a couple mechanics that have been there from the mid 70's !! No luck. Was pleasantly surprised that they did ask around and tried to help me,