searching for info on this l78

[Richls5]

car is now home and going through paperwork i was able to contact the gentleman who owned it from the early 90's till 03 he claims the 396 in it when he got it was a 2 bolt block but also had no idea what an l78 was either. he took the m21 out in 97 to put a th350 in. He bought it from someone north of baltimore. so the car was in maryland at least from the late 80's till when i bought it just last week. I contacted jim mckay chevrolet which is still in business but got the run around because i'm not buying a new car.