904/727 torque converter spline counts

Trans # 2 is a 904 from a 67 Cuda/Dart/Valiant with a 273.

Trans # 1 is a lot tougher because all the trans numbers in my list start with either 2, 3 or 4 and are 7 digits in sequence so I'm not sure what to make of that one. If it's possible the 8 at the beginning is really a 3 and you ignore the space and one zero you have 3410637 which is a 1970 904 from behind a 318, but that's a real stretch of a guess. One thing I forgot to mention earlier that the first group of numbers are all that shows up on my list so you can ignore the second group of numbers